bing tracking image
  1. Trailer Brake Controller
  2. CURT
  3. Proportional Controller
  4. Up to 4 Axles
  5. OLED Display
Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional

Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional

Our Price: $189.95
You Save: $47.48
Trailer Brake Controller
This item qualifies for Free Shipping
Shipping Weight: 0.54 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Proportional brake controller features large, high-quality 1-1/2" OLED screen that displays full-text readout. Includes 9 sensitivity settings, reverse polarity protection, and continuous diagnostics. Lowest Prices for the best trailer brake controller from CURT. Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional part number C49UR can be ordered online at or call 1-833-496-1390 for expert service.
  • All Info
  • Reviews (30)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Trailer Brake Controller

  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • OLED Display

Proportional brake controller features large, high-quality 1-1/2" OLED screen that displays full-text readout. Includes 9 sensitivity settings, reverse polarity protection, and continuous diagnostics.


  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Activates immediately - no pausing like with time-delayed brake controllers
  • Large, high-quality 1-1/2" OLED screen displays full-text readout
  • 9 Sensitivity settings (boost settings) let you adjust initial braking power and aggressiveness
  • Triple-axis accelerometer is highly responsive - ensures smooth, uniform stopping action
  • Continuous diagnostic check alerts you to any potential problems
  • Integrated safeguards protect your vehicle, the trailer, and the controller
    • Minimizes drain on car battery by entering power conservation mode after 30 minutes of inactivity
    • Keeps trailer brakes from overheating by reducing power output to them during prolonged stops
    • Defends brake controller and trailer breakaway systems against shorts
    • Prevents positive and negative power reversal with built-in polarity protection
  • Compatible with low-voltage systems, PWM systems, ABS, and cruise control
  • Mounting bracket and hardware included
    • Plug-in, vehicle -specific brake control adapter (sold separately) can be used for certain applications to reduce installation time


  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric or electric-over-hydraulic trailer brakes
  • Limited lifetime warranty

Proportional Braking

With a proportional brake controller, you can get heavy-duty emergency braking, general braking, or slow-to-an-idle braking for your trailer automatically. The intensity with which your trailer brakes are activated and the rate at which they are applied are dependent on the deceleration of your tow vehicle . This means that, unlike time-delay controllers - which send the same amount of preset power to your trailer brakes every time - proportional controllers are able to adapt to every braking situation differently. So, if you slam on the brakes in your truck, your trailer brakes will activate with that same extreme intensity. And if you merely slow down as you approach a red light, your trailer will gradually brake in the same manner. Just set the initial power level, select a sensitivity setting, and you're good to go.

As long as the Assure controller is properly mounted as indicated in the instructions, it will sense - via an internal inertia sensor - how your tow vehicle brakes. This triple-axis, inertia-based sensor responds to the deceleration of your tow vehicle as you brake by signaling the controller to send out enough power to your trailer brakes so that they are activated with an intensity that matches. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.

OLED Display

The high-quality OLED display on this brake controller makes the screen much easier to read at a glance. And instead of displaying codes, which have to be looked up, this display shows full-text description of errors. By showing everything this way, you will be able to clearly and quickly see what is happening in real time with your trailer.

Sensitivity Settings

Once you have the overall power set, you can fine-tune the power output by adjusting the sensitivity of the internal sensor.

Use the switch on the side of the Assure to achieve your desired degree of intensity. Move the switch toward you to boost the power output, causing your trailer brakes to activate with more intensity right off the bat. This means that they will also reach maximum braking faster simply because they will start out at that higher intensity. This is particularly beneficial if you are towing a heavy load because the intensity required to stop that load may be far greater than that needed to halt your vehicle. Therefore, sending out more initial power to the trailer brakes - and causing them to reach maximum braking faster - allows you to better control the trailer so that it doesn't push your tow vehicle before coming to a complete stop.

There are 9 sensitivity levels (boost levels), with 1 being the least sensitive. At level 9, the sensitivity of the internal sensor is as high as it can go. When you change the setting, the display on the Assure will flash the level before reverting back to showing the power output.

Built-In Controls for Adjustable Power

Gain Control: This button will set the maximum power available when your trailer's brakes are applied. The OLED display will show the current output setting being used.

Load Control: This button will allow you to determine how aggressive you want your trailer's brakes to be. This is typically dependent on your personal driving preference.

Manual Control: When you push this, only the trailer's brakes will be applied. This can be used to send precise amounts of braking to your trailer at your discretion. The braking intensity will be indicated on the OLED display when you press this button.

Safety Features

The Assure offers advanced safety features to prevent damage to various components of your towing setup.

When the Assure is not in use, it will be in power-saving mode, reducing the power draw to minimize drain on your vehicle's battery. This power-conservation mode begins after 30 minutes of inactivity and ends the moment your vehicle's brake pedal is pressed. When you stop at red lights, or any time that your truck and trailer are at a standstill with the brakes applied for a prolonged period of time, the Assure will reduce the power output to your trailer's brakes, preventing them from overheating.

If ever there is a time that you need to brake your trailer separately from your tow vehicle, the manual override is easily accessible. Pushing this button engages the brakes on your trailer with either full power or the maximum power allowed by the output level, depending on which setting you select. In addition, when you activate this override, the brake lights on your trailer will illuminate, properly warning those behind you of the braking action of your rig.

Automatic Leveling and Simple Installation

The self-leveling feature of the Assure ensures that the brake controller continues to function even as you drive up steep hills or through the mountains. Simply mount it in your cab at a vertical angle that is within 90 degrees, and the controller will level itself automatically. Make sure that the controller is also positioned so that the side-to-side angle is within ±20 degrees.

Installation is a snap. After mounting the Assure unit in your cab using the included bracket, hardwire one end of the included pigtail harness directly into your vehicle. The other end plugs into the brake controller. To transfer the Assure to another vehicle or to remove it for storage, just unplug the unit and remove the screws that hold it in place in the bracket. Curt offers a spare mounting bracket (C51144 - sold separately) that can be used to affix the Assure in your other automobile.

Installation Accessories

For even easier installation, a vehicle-specific wiring adapter (sold separately) is available for most newer trucks and SUVs. One end of the custom adapter plugs into your vehicle, and the other end plugs into the controller - no hardwiring required.

Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications

See also's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.

51160 Curt Assure Proportional Trailer Brake Control with Dynamic Screen

Item # C49UR

Installation Details C49UR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional - C49UR

Average Customer Rating:  4.6 out of 5 stars   (30 Customer Reviews)

Proportional brake controller features large, high-quality 1-1/2" OLED screen that displays full-text readout. Includes 9 sensitivity settings, reverse polarity protection, and continuous diagnostics.


The resources at made my purchase easy. By having specific truck lookup ,correct wite adapter and specific product videos. Looking forward to my first trip with curt assure brake controller.


2006 Dodge Ram. Easy install. Plug it in and tie up the wires. I put a wire protector sleeve to cover the wires coming out of the controller.


VERY easy install. As mentioned in other reviews the hardest part is finding the factory plug in for a 2017 Tacoma. Toyota tucked it way in the back behind a wire bundle. Picture attached for reference.


Controller worked great. Stops smoothly and properly. The only problem is when I disconnect the trailer the display continues to say there’s a problem and won’t stop until I unplug it. Called technical for help and he said there’s a short somewhere but I haven’t found any short or cause.


The directions on this item are horrible. I finally figured it out and was able to install it onto my Ram 1500, but only after spending hours trying to make everything fit right. If you're looking for a hitch setup to pull a trailer long distances, I would advise you to look at other options. This will work for my short trips with my half-ton pickup, but I would not want to pull anything more than 50 miles with this setup.


Noah A did a fantastic job of making sure I had the right product and referred me to their video library for installation instructions. Absolutely a fantastic representative of this company 5 out of 5 stars for sure. Good follow up as well!


Much smoother braking than my previous controller that the RV dealer put in. Curt has excellent customer service.


The product worked great, but I am annoyed because etrailer wouldn't take it back even though I hadn't used it.


easy to install, but needed correct cable for tundra works just fine with large trailer


Customer service is awesome needed this to pickup my trailer tomarrow they were able to get it to me next day. Also ygis trailer brake literally plug n play on 2003 chevy suburban.


Brake controller came in less than 48 hours! Looks great, going to hook it up today! Thanks Etrailer


Great product! Staff very helpful!


Was easy to order and order was delivered quickly while a staff member always stayed in contact with me giving me updates on my order


Customer service is off the charts awesome job !!!!!


Install video and instructions on my 2007 Toyota Tacoma where very helpful, thank you for the kit!


Easy to install in my 2021 Toyota Tacoma. Make sure to order separate connector. The white connection is behind the foot rest left of the brake. Easy to find, installed in about 20 minutes.


Package was delivered on time and in great condition.


hayley was very helpfull


Thanks for getting all the parts to me in a timely fashion.The product information was very helpful so that I could see how I can install in the right order.
Thanks again for your help.







Show More Reviews

See what our Experts say about this CURT Trailer Brake Controller

< Previous

Do you have a question about this Trailer Brake Controller?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer brake controller information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Eric H
Updated by:
Eric H
Employee Clayton O
Test Fit:
Clayton O

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-833-496-1390