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Demco SBS Delta Force Portable Supplemental Braking System - Proportional

Demco SBS Delta Force Portable Supplemental Braking System - Proportional

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Tow Bar Braking Systems

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Demco Recurring Set-Up Tow Bar Braking Systems - SM99242
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Product Expert Mike S

Is this right For you? Product Expert Mike S says:

Yes, if you:

  • Need to be able to switch between towed vehicles, but don't have room in your RV to stow a big braking system
  • Want the best braking a portable system has to offer
  • Want the peace of mind that you won’t arrive at your campsite with a dead battery

No, if you:

  • Want a system that doesn’t require any setup so you can hit the road faster
  • Have a tow vehicle with uneven floorboards
Portable unit activates when your RV's brake lights go on and an inertia sensor in the towed car detects deceleration. Delivers automatic, proportional braking to your towed car. Extremely compact unit is easy to install, remove, and store. Lowest Prices for the best tow bar braking systems from Demco. Demco SBS Delta Force Portable Supplemental Braking System - Proportional part number SM99242 can be ordered online at or call 1-636-306-4830 for expert service.
  • All Info
  • Reviews (16)
  • Q & A (0)
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  • Why etrailer?

Demco Tow Bar Braking Systems

  • Brake Systems
  • Hydraulic Brakes
  • Air Brakes
  • Air Over Hydraulic Brakes
  • Proportional System
  • Portable System
  • Demco
  • Recurring Set-Up
  • Power Assist Brake Compatible

Portable unit activates when your RV's brake lights go on and an inertia sensor in the towed car detects deceleration. Delivers automatic, proportional braking to your towed car. Extremely compact unit is easy to install, remove, and store.


  • Supplemental braking system applies towed vehicle's brakes in proportion to braking action of RV
    • Towed car's brakes are activated at the same time and with the same intensity as those in your motor home
  • Inertia sensor detects deceleration and signals system to activate brake pedal with proportionate amount of pressure
  • Dual-signal activation setup prevents false braking
    • Coach brake light must be on for system to activate towed car's brakes
    • Optional installation method relies on inertia alone - no need to splice into tow bar wiring
  • Sensitivity control lets you regulate how aggressively the towed car's brakes activate
    • Set sensitivity high so that unit responds to even minimal slowing of RV
    • Set sensitivity low so that unit activates only with intense stopping action from RV
  • Portable operating unit is easy to position, adjust, and remove
    • Unit anchors to firewall with included tether cable - no need to push against seat for proper positioning
    • Brake pedal clamp installs and adjusts easily for a snug and secure fit
    • Adjustable feet allow you to level the unit on uneven floors
    • Actuator rotates on ball-and-socket joint to achieve the best leverage
  • Easy-to-use touchpad on operating unit lets you set braking power based on your specific car
    • Hybrid setting ensures compatibility with cars that have continuous-power-assist brakes
  • Charge circuit pulls power from RV to ensure towed car's battery stays charged
  • Monitor mounts in coach and plugs into 12V accessory outlet
    • Displays braking force and monitors the connection with the towed car
    • Provides visual and audible alerts for error codes and breakaway situations
  • Breakaway included
  • Made in the USA


  • Operating unit dimensions: 10" long x 6-1/2" wide x 5-1/2" tall
    • Feet adjust up to 2" tall
  • Weight: 9.5 lbs
  • 5-Year warranty

A supplemental braking system is crucial when you tow a car or truck behind your RV. Without it, the weight of the towed car can create a safety hazard, strain your RV's brakes, or affect your RV's warranty. Most states require a supplemental braking system.

Automatic, Proportional Braking

The Delta Force is both automatic and fully proportional. In dual-signal mode, this system relies on your towed car's momentum as well as your RV's brake light signal to activate. As a result, the Delta Force will automatically activate any time you engage your RV's brakes, so long as there is enough deceleration for the system to detect.

An inertia-sensing, analog mercury switch inside the Delta Force's operating unit is what makes this system proportional. This fail-safe switch reads and interprets changes in forward momentum that occur when your towing setup decelerates. As your RV and car slow down, this switch sends a signal to activate your towed vehicle's brake pedal with an intensity that matches the deceleration of your RV. The result is even braking across your towing setup. Whether you lightly tap the brakes in your RV or apply them hard in a panic situation, your towed car's brakes will be applied proportionately.

Dual Activation Signals

When the Delta Force detects a change in forward momentum and the coach brake lights come on, the actuator applies proportionate brake pressure to your car's brake pedal. If the internal mercury switch is powered but there is no change in momentum, the system will not trigger the towed car's brakes. Likewise, if a decrease in forward momentum occurs but there is no brake light signal from the RV, the system will not activate the towed car's brakes. Because the Delta Force is designed to rely on the application of your RV's brakes, there is no false braking when you have the system in dual-signal mode. So you can drive over rough terrain and steep grades without any of the false braking that can lead to a rough ride for you in the RV and that can also wear out your towed car's brakes over time.

Using the dual-signal mode is optional. For a quicker installation, you can set up the Delta Force system to activate based solely on inertia. But it is recommended that you tie into your tow bar wiring to set up the system in dual-signal mode for a safer, more reliable braking system.

Brake Sensitivity Settings

The Delta Force allows you to fine-tune the braking sensitivity to fit your personal preference. By adjusting the sensitivity on the operating unit, you get to decide how intense the change in forward momentum must be for the internal sensor to respond. Set the sensitivity low and the Delta Force will only respond when you forcibly step on your RV's brake pedal. Set the sensitivity high and it will respond when you merely tap your RV's brakes.

Small, Portable System

The Delta Force is smaller than most other portable braking systems, making it easier to position for use and to remove for storage. You can store the unit in your trunk and still have room for groceries. And unlike larger units, you can mount the Delta Force without having to reposition your driver's seat.

Demco SBS Small Unit

The Delta Force is tethered to your vehicle with the included cable. This cable ensures that the unit stays in position, even as the actuator pushes on the brake pedal. This way, the unit won't push against the seat for positioning. As a result, the unit won't slide up your seat and cause failure like other portable braking systems might.

The Delta Force's air compressor powers the actuator so that it will apply pressure to your towed car's brake pedal. To get power for the air compressor, the operating unit will plug into your towed car's 12V accessory outlet.

Initial Installation

The Delta Force is easy to install. It requires very little drilling and just some simple wiring.

You will need to drill and cut into your vehicle's firewall to tether the unit with the included stainless steel cable. This tether allows the actuator to work without having to use your seat for leverage. By properly tightening the tether, you keep the unit from moving. You won't need any additional brackets to keep the unit from repositioning.

Demco SBS Delta Force Pedal

The pedal clamp holds the actuator in place on the pedal. To adjust the clamp, loosen the center knob and slide the top and bottom brackets up and down until you achieve the correct fit. Once you've tightened the knob to set the clamp in position, you won't need to adjust it again to tow the same vehicle. Simply hook the top bracket over the top of the brake pedal and push the clamp into place on the pedal.

Demco SBS Delta Force Actuator

The actuator depresses your towed car's brake pedal when you apply your coach brakes. This actuator attaches to the front of the operating unit with a ball-and-socket joint that allows for all-around flexibility. The joint rotates in a manner similar to the way your ankle rotates as your foot depresses the brake pedal during normal driving. With this flexibility of movement, the actuating cylinder stays perpendicular to the brake pedal no matter how far it is depressed.

Adjustable feet allow up to 2" of height adjustment so that you can level the operating unit on the floor of your towed vehicle. When setting up the feet, make sure that the actuator does not touch the lip of the operating unit.

Demco SBS Delta Force Monitor

The Delta Force's CoachLink monitor installs in your RV and lets you keep tabs on the braking unit in your towed car. The CoachLink displays the amount of force used during braking and it continually monitors the connection with the towed car. Visual and audible alarms alert you in the case of a breakaway situation or an error code. You can use the monitor in your coach, along with your GPS, satellite radio, and other electronics without interference because the CoachLink operates using radio frequency. And this wireless monitoring device is FCC compliant.

Continuous Setup

Once you have the unit tailored to your towed car, you can quickly and easily set it up when you're ready to tow. Just position the Delta Force on your floor, hookup the tether cable, and attach the pedal clamp.

Demco SBS Delta Force Braking Profile

Delta Force's control touchpad is located on the operating unit. This touchpad lets you manage your brake settings. To begin setup, push the "initialize" button. The system will run digital diagnostics on the internal air tank, compressor, actuator, tranDemco SBStter, and pedal connection. Use the "select" button to toggle through to your towed vehicle style. There is even a braking profile that allows for a hybrid car's continuous-power-assist brakes.

Once you have your braking profile set, you can adjust the sensitivity by turning the gain knob at the bottom of the unit. Then, you can also choose the "boost" option to increase the sensitivity an extra 15 percent.

Charging Circuit

During towing, keep your towed car's running lights on and the operating unit plugged into your car's 12V outlet. To ensure that there is sufficient power in your towed car's battery to operate the Delta Force for the duration of your trip, a charge wire is included. With the charge wire, you can connect the coach's wiring to your vehicle. Just run the wire from the running light circuit on your RV to the towed car's battery to maintain a charge.

Breakaway Switch

The included breakaway system ensures that your vehicle will come safely to a stop if it accidentally detaches from the RV while being towed. A switch mounts to the front of the towed car. This switch - which is wired into the operating unit - includes a pin that connects to your RV's hitch receiver with a breakaway cable. If the car separates, the cable pulls the pin from the switch, causing a signal to be sent to the operating unit to apply your towed car's brakes.

9599004 Demco SBS - (Formerly SMI) Delta Force Supplemental Braking System

Replaces Demco SBS SM99242

Item # SM99242

Installation Details SM99242 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Demco SBS Delta Force Portable Supplemental Braking System - Proportional - SM99242

Average Customer Rating:  4.1 out of 5 stars   (16 Customer Reviews)

Portable unit activates when your RV's brake lights go on and an inertia sensor in the towed car detects deceleration. Delivers automatic, proportional braking to your towed car. Extremely compact unit is easy to install, remove, and store.


Works well, small and easy to install. I especially like feature that cannot apply brakes unless brake lights on tow vehicle illuminated.

Works well after 1 year. Cut piece of plywood with slots for legs to sit on floor to keep unit from moving
James - 06/08/2022


It sucks, I would like to have my money back, I had it on two vehicles didn’t perform on either one.
The remote to control the amount of breaking on tow vehicle doesn’t work sometimes it beeps sometimes it doesn’t, never has shown the breaking power. I had this system installed by a professional at his shop. It’s junk in my opinion. I would not recommend this product to anyone. It dangerous. Since you contacted me for my review/opinion . You want a satisfied customer? Send me a refund.

I am sorry to hear that this product is not working out for you. This is still under warranty and I will email you the manufacturers information to see what we can do to fix this issue for you.
-- Etrailer Expert Sierra K - 09/28/2021

Chevrolet Spark

Performs well in a 2021 Chevrolet Spark. Videos on installation were NOT very helpful. It is easier and better to route all wires for power outlet, battery shutoff, and brake control cord through the firewall on the passenger side just above the air conditioner drain hose. All these wires can then be routed alongside the tail light wiring up to the battery area. Do NOT try to pass wires through firewall grommet behind the battery - it appears to be impossible and it’s just a bad location for securing the wires in the pedal area.


Great product!!

2014 Jeep Grand Cherokee

I really like the size of the system. It is extremely easy to store and I can use it in my toad for three long days of towing without it running my toad's battery down.
I had a couple of problems. First the gain adjustment is not fine enough to set the brake system just right (more a personal preference). The radio range for the monitor in the coach would not reach my toad at about 40' away. I had to route the antenna wire to the rear of my coach to get reception. After about 8 months of use it started leaking. I contact SMI and they repaired the leak and even upgraded the radio system to a 900mhz system to fix my range issue at no cost. SMI backs their warranty claims and put the extra effort to make sure the customer is happy.

Suzuki Reno

The original install was fairly easy. But I found the adjustments difficult to perform and extremely sensitive. A couple of times it locked up the brakes on the tow vehicle and I dragged it a good distance. The only way I could fine tune the braking force was to have someone drive the coach while I sat in the passenger side of the tow vehicle and adjusted the system. I got it to work and used it on a trip from San Diego to Yosemite and up to the Reno area.


Works good. For some reason though not sure if it was my error but second time using it wouldn’t let go of toad brakes. Before I realized it wore down all pads , front rotors and front calipers


fairly easy installation in a full size GMC pickup. however, the floor has a large hump in front of the seat, which requires extending all 4 of the screw legs to keep it level. unfortunately, this makes the unit too top heavy. and after applying brakes, it ends up "riding the brake pedal" which keeps the brake lights on. made multiple tension adjustments that made no difference. so far, i've been unable to get the unit to respond in "dual mode". it works with proportional inertia when stopping suddenly or hard. at least if I get pulled over, I can show it's installed.


The people at etrailer were fantastic

2015 Jeep Wrangler Unlimited

Working on installation today. Not real happy with the fitment of the brake pedal clevis, seems loose but will see if it stays.


I haven't tried the brake unit yet, but the installation was simple and straight forward.


I will be installing this on Friday, Aug. 14th, the videos have been very helpful in preparation, and this looks like a very high end system.


Install a bit tricky cause the install manual is thin on details. Once installed it was easy to setup and operate.


It's quirky and needs lots of power.

2015 Jeep Wrangler



See what our Experts say about this Demco Tow Bar Braking Systems

  • Picture of the Breakaway System of the SMI Delta Force Supplemental Braking System # SM99242
    I attached a picture of the breakaway system that the SMI Delta Force Portable Supplemental Braking System # SM99242 that you referenced uses.
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    Image 1 for
  • Will SMI Portable Supplemental Braking System Activate Using Engine As Brakes Downhill
    As long as your RV's brake lights come on when you are using the engine brake the SMI Supplemental Braking System part # SM99242 will know to start sensing deceleration and apply the Pilot's brakes. If you are just running the RV in a lower gear without using an actual exhaust brake you would need to ride the brakes just enough to activate the brake lights to get the system to activate.
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  • Recommended Braking System To Flat Tow a Honda CRV
    To flat tow any vehicle, a braking system in the vehicle is required in most states and Canadian provinces. A supplemental braking system can decrease the braking distance up to 30 percent in some towing setups and it will ease the wear and tear on your towing vehicle. It also is required by most RV companies as a stipulation of the warranty. I recommend the Delta Force # SM99242. This system allows your CRV to brake with a similar amount of force and with the same timing as your...
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  • Is Floor Board Bracket Required When Installing SMI Braking System On 2017 Jeep Wrangler
    The installation of the SMI Delta Force Portable Supplemental Braking System, part # SM99242 does not require an adapter for the floor of your 2017 Wrangler. The system is held in place by attaching a small bracket to the firewall and then use a tether to hold the unit secure. Per the attached instructions, the carper will need a slit to access the mounting bracket when installed. When you are not towing you can disconnect it from the unit and tuck it out of the way. Included with the...
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  • Dimensions of the SMI Delta Force Braking System for a 2013 Lincoln MKT
    The SMI Delta Force braking system # SM99242 does fit your 2013 Lincoln MKT. It is 10 inches across, 5-1/2 inches tall. For the depth you can measure from the front of the driver's seat to the brake pedal and subtract 6-1/2 inches. This measurement is different on every vehicle.
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  • What Type of Braking System is Needed to Flat-Tow a 1990 Jeep Cherokee
    I think you are confusing a brake controller with a supplemental braking system. A brake controller is used when towing a trailer whereas a supplemental braking system is used when towing a vehicle. A brake controller would do you no good towing your 1990 Jeep Cherokee but a supplemental braking system like the SMI Delta Force Portable Supplemental Braking System part # SM99242 would. The Delta Force is easy to install and remove from the vehicle. It will apply the brakes in the toad at...
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  • Is Pre-Set or Proportional Braking System Better for Flat Towing
    I absolutely recommend a proportional, inertia-driven braking system when flat towing any vehicle, much less a heavier one like your Ram 3500 because of exactly the reasons you mentioned. These types of systems don't rely solely on the brake light to engage the towed vehicle brakes but will simply send back a proportionate amount of power based on the vehicle's deceleration. The SMI Delta Force Braking System # SM99242 is a really great portable option that uses its integrated inertia...
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  • Does Flat Towing Affect Odometer Mileage?
    The general rule of thumb is that if your vehicle has an electronic odometer, the odometer, sensors and associated electronics won't be powered up while flat towing, your odometer will not show the towed mileage. Conversely, cars that have a mechanical odometer will show the mileage towed as part of the odometer reading. With that being said, not all vehicles are flat towed in the same conditions; some required ACC mode to be enabled and the battery connected. Taking into consideration...
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  • Why is There Diode Wiring in the Demco SBS Delta Force System?
    While the Demco SBS Delta Force Portable Supplemental Braking System can be set up so that it only uses inertia to brake, the kit also comes with optional tow wiring and breakaway connections. The diode wiring referred to in the video is from connecting the tow wiring harness that comes with the kit. It is up to you if you want to use it or not, but it is nice that you have that option for extra safety and security.
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  • Adjusting The Braking Sensitivity On Demco SBS Delta Force Portable Braking System
    When you are adjusting the sensitivity on your Demco SBS Delta Force Portable Supplemental Braking System # SM99242 it will activate the pedal to let you know where they need to be set at. This is from page 16 of the installation instructions that I have also linked below. "With setup complete, set the baseline by loosening the black sensitivity knob and raise the knob towards the more sensitive position until activation begins. Once activation begins, slowly move the knob towards less...
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  • Does SMI Delta Force Portable Supplemental Braking System Apply Brakes Use Vehicle's Vaccum Assist
    The SMI Delta Force # SM99242 does not use vacuum pressure like the SMI Stay-IN-Play DUO # SM99251. The Stay-IN-Play DUO ties into your vehicle's vacuum line and uses it to assist in braking. Since the Delta Force does not it applies more pressure to the pedal (As do many other braking systems) to get the same amount of braking force necessary to slow the vehicle.
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  • SMI Delta Force Brake System 2nd Vehicle Wiring Kit
    For your 2004 Jeep Liberty to use your SMI Delta Force Portable Supplemental Braking System # SM99242, you will simply need to get a 2nd vehicle kit. This 2nd vehicle wiring kit is # SM99249.
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  • Second Vehicle Kit Recommendation for SMI Delta Supplemental Braking System
    We do have a second vehicle kit for the SMI Delta Supplemental braking system part # SM99242 that you referenced as the part number # SM99249. This comes with everything you'll need to install the Delta on a second vehicle like what you see in the attached picture.
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    Image 1 for
  • Can You Have a Air Force One Installed With a Stay and Play Duo Supplemental Braking System
    I reached out to Demco as I have never experienced anyone trying to use both systems together. Their recommendation was to use the Demco SBS Delta Force Portable Supplemental Braking System # SM99242 if you are using with both hydraulic and air brake vehicles. Otherwise you would need to have an entire separate Demco SBS Stay-IN-Play DUO Supplemental Braking System # SM99251 installed in your Jeep Wrangler. Which means you would have 2 separate breakaway systems and 2 separate cylinders...
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  • Will SMI Delta Force Portable Braking System Work on 2019 Honda Fit
    Yes, the SMI Delta Force Portable Supplemental Braking System # SM99242 will work perfectly on your 2019 Honda Fit. Whether or not a system like this will actually activate the brake lights when pressing down on the pedal depends on the specific vehicle it's being used on (how the tail lights function when in the correct mode for towing). Based on my research though the brake lights for your 2019 Honda Fit should indeed still illuminate when the Delta Force applies the brakes. This along...
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  • Second Vehicle Kit for Demco Air Force One to Install on New Towed Vehicle
    We have a second vehicle kit for the Demco Air Force One with the part # SM99209 which comes with just the components you'd need to install on the new 2021 Jeep Wrangler you have to use with the rest of the Air Force One # SM99243. I also attached an install video for the Second Vehicle Kit on a very similar 2022 Wrangler as well.
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  • Supplemental Braking System that Does Not Require Splicing
    For a braking system that will completely bypass the wiring on your Jeep Wrangler, I recommend installing the SMI Delta Force Braking System, # SM99242. This is a portable braking system that you can take with you from one vehicle to the next and you don't have to splice into your Jeep's wiring at all which should alleviate any warranty or wiring concerns you may have. This is a proportional braking system that uses the inertia generated from your motorhome braking to apply the Jeep's...
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  • Recommended Delta Force Supplemental Braking System for 2013 Honda CR-V
    The SMI Delta Force Portable Supplemental Braking System - Proportional # SM99242 is a confirmed fit for your 2013 Honda CR-V. You will need to use 12 Volt Outlet Kit # RM-9332 for that application. It is a good product and works very well for a lesser price than the similar products that have the plastic housing and in essence do the same thing. I've attached some videos to assist as well as the installation details. SMI makes great products and was recently bought out by Demco. We...
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  • Troubleshooting A Demco Delta Force Supplemental Braking System That Wont Activate
    Since the Delta Force # SM99242 is not receiving power from the factory 12v outlet when your Jeep is off you'll need to install a 12 Volt Outlet Kit, 20 amps # RM-9332 that will run directly to the battery to power the unit. This is most likely the cause of the breakaway switch not activating when the plunger is pulled as well. Once you have power running to the system try pulling your breakaway plunger again. If it does not activate the braking system then you'll want to retrace your wiring...
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  • Can I Use A Breakaway System Without a Supplemental Braking System?
    Without a Supplemental Braking System # SM99242 the Hopkins Replacement Break-Away Switch # HM20010 does not have a braking system to activate when your flat towed vehicle becomes disconnected.
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  • Powering Breakaway Switch and Indicator Light for Air Force One on a 2014 GMC Sierra 1500
    The parts of the Air Force One braking system # SM99243 that need power (breakaway switch and indicator light) can attach directly to the vehicle battery. They will still function even if the negative cable is off of the battery because they just need the positive terminal and a ground location. Only the 2014 GMC Sierra 1500 will not have power with its negative cable removed. Electrical devices independent of the vehicle wiring can still function. If you are talking about the Delta Force...
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  • Supplemental Braking System Recommendations for Flat Towing a 2014 Ford F-150 Behind an RV
    Supplemental braking systems are a key part of any flat towing set up so you definitely want one that will work best for your 2014 Ford F-150. One of the preferred systems for our installers and what I recommend is the Stay-IN-Play DUO proportional system, # SM99251. It will apply the truck brakes in proportion to how much the tow vehicle is braking. This is the safest way to stop and it reduces wear and tear on both vehicles. Installing the DUO is definitely more involved than a portable...
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  • Installing The Roadmaster Battery Charge Line Kit And A Demco SBS Delta Force Breakaway Switch
    The Roadmaster Battery Charge Line Kit for Towed Vehicles # RM-156-25 is going to have a wire from the center terminal of your Jeep's 6-way to the gold post (BAT) of the breaker and from the silver post (AUX) of the breaker to the positive terminal on your Jeep's battery. The Demco SBS Delta Force Portable Supplemental Braking System - Proportional # SM99242 is going to have a wiring harness with a black wire which will need to be spliced together with the blue wire from your breakaway....
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  • Components Recommended for a 1997 Chevy Suburban 1500 4WD
    There are several components needed to flat tow a vehicle. The first thing you will need is a vehicle specific base plate kit. For that I recommend you get the Demco # DM9518019. This will provide that attachment point for a set of tow bars. For tow bars you could use a the Dominator # DM9511008 which pairs up with the base plastes. This comes with safety cables. To determine which lighting solution would be the best for you I attached an FAQ article on how to pick out the best lighting...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video by:
Andrew L
Employee Dustin K
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Employee Lisa S
Written by:
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Employee Randy B
Test Fit:
Randy B
Employee David F
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Employee Wilson B
Updated by:
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Employee Kristina F
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Employee Mike S
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