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SMI Air Force One Braking System Installation - 2019 Jeep Cherokee

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How to Install the SMI Air Force One Braking System on a 2019 Jeep Cherokee


Speaker 1: Tody on our 2019 Jeep Cherokee, we're gonna be taking a look at . I'm gonna show you have to install the SMI Air Force One Supplemental Braking System, part number SM99243. The air force one is gonna be one of five main components in a flat tow set up. The other four are gonna be your base plate, your wiring, your tow bar, and your safety cables.The air force one, keep in mind can only be used with RVs that have air brakes. The nice thing about the air force one though, is that it's a truly proportional air system or a truly proportionally braking system, because it's working off the air pressure coming from the RV. Your kit's gonna come with a tank, air lines and T fittings that you attach to your RV's air brake system.One of the great things about the air force on is, once it's installed, it's completely maintenance free.

You're not gonna have to do anything with it. You're not gonna have an on and off switch that you have to worry about turning on or off when you're flat towing or not flat towing your vehicle. And you're not gonna have any sensitivity settings for your air pressure to apply the brakes. It's simply working off the air brakes coming from the RV.This is what our operating unit looks like after it's mounted in our towed vehicle, or in our Jeep. This is what is going to supply the air pressure to work the actuator mounted to the brake pedal to apply the brakes.

You have your vacuum line that gets tied into the vacuum line on your car or on your Jeep. You have your air in and out. Air in is supplied from the RV, which is, this line is routed to the front of the Jeep and then you have your blue air line that runs to the back of the RV. Your air out, runs inside the vehicle and is attached to the actuator which is on the brake pedal, supplies the air pressure for that.Now that we have the Air Force One hooked up to the back of coach, you can see where I mounted my L bracket here with my air fitting. I have my air line attached, simple to do, you just push it in.

Then we run it across, and it hooks right up to the front, on our L bracket on out towed vehicle, or our Jeep. Works the same way, you just push it into place. This air line is gonna supply the air for the Air Force One, to actually apply the brakes in our towed vehicle, or in our Jeep while we're flat towing it. This system is gonna be a proportional system, which means, it's gonna match the mount or air pressure or match the amount of pressure force being applied to the brakes in the coach so it applies the same in the Jeep. What's great about this system is this is a truly proportional system.

What I mean by that is, it's running of the air brakes coming from the RV.Next we have our break away switch. What our break away switch is gonna do is, this is an emergency situation. If our vehicle becomes detached from our RV or from our tow bar, this pin is gonna be pulled, and it's gonna apply the brakes in the car, so it brings the car to a safe stop. You can see the tether here. You gotta put on the wire, attached to the pin. The other end has to be attached to the RVs hitch in its own location. It can not be tied it or attached with safety cables or anything else. Again it has to be on its own location.Now that we've gone over some of the features of it, let me show you how I installed it. First thing you're gonna do is start your insulation. So you'd find a good place to mount your operating unit. This is that best place that I've found, is right on top of your fuse panel cover. You just wanna make sure when you mount this and there, that your blots aren't so long that they go through and touch any of the fuses and you wanna make sure that you leave enough line with every thing that we're gonna be connecting, that if you need to take this cover off, you can set it aside or out of the way to do any work you need to do on the fuse panel.Next what you can do, pull off this cover, and just pull up on it, like that. Set it aside. You're gonna get some vacuum line that comes in your kit, a couple of check valves. From your right operating unit, cut off a piece of that air line or that vacuum line, about three inches, roughly. Put it into your check valve and make sure the black side is facing the operating unit. Green sides facing in. You're running that air line tube down or the vacuum line down. So I went across like this and underneath. You wanna make sure you don't have any big kinks or bends in it. The vacuum line is gonna connect into the vacuum line coming off of the brake booster.The way this is set up, you can see a check valve here, check valve here. We always wanna do the engine side. There was just a single vacuum line that went from the engine, did a little turn and came into this side of the check valve. What we did, is a cut that piece hose out to here. Right on this end, I added another check valve, black side facing toward the engine. Added in some vacuum line, added in my T connector in the middle, a little bit more vacuum line. Then put it back on this check valve, the factory check valve. Took my vacuum line that I ran underneath and put it into the bottom of my T fitting.Next thing you wanna do is you wanna mount your breakaway switch. Plenty of plastic here on your bumper fixture if you wanna mount it there. I myself don't like drilling into the bumper if I don't have to. I use the bracket that came in my kit with my base plate and mounted my breakaway switch on it. Used a no drill mounting bracket, long bracket. Drilled a couple holes in my bumper beam. Mounted the long bracket to it and then just mounted this six pole bracket to it. This six pole bracket has some extension sides that come off of it that have holes in it and that's where I mounted this and actually that's where I mounted my air fitting, which is another thing that comes in your kit that you're gonna have to mount. So, this gives you the option to mount both of them on that one bracket.Of the back of this, you're gonna have two wires, you're gonna have a blue wire and a orange and black wire. I don't know if you can seem them, but I routed them right through the drill here. Didn't have to cut a hole, which makes it nice because there's already holes in it. It helps maintain a nice clean look on the front of the vehicle. There's a washer that comes in the kit. If you put it in between your breakaway switch and this bracket, it allows you to rotate it so it hides. You can hide it, it's not sticking out to the front of the vehicle being a big eyesore. So, run your wires in, orange or black wire. I routed them right up through this plastic, right up behind my headlight, underneath where my headlight mounts here. Underneath this crossbeam, or this bar, support bar, to here.Of your operating unit, you're gonna have two black wires. One of the black wires you're gonna add on to the blue wire. You're gonna have butt connectors that come in your kit. I would suggest using heat shrink butt connectors. It's gonna help protect you connection from any dirt debris and moisture. It'll help to keep the connection from corroding. The second black wire, I routed it around. If you look right here, I actually grounded it to the factory ground, that way I don't have to drill any extra holes in the body of the vehicle that I don't need to.Next, you're gonna get a bundle of air line tube. On your operating unit you're gonna have and air in and air out. Make sure one end is cut flat and not cut at an angle, or it's not kinked. If it is, cut it flat. You're gonna insert it in the air in port. Push it in until it stops and then give it a little tug to make sure it's in there. Route your air line tube. I routed mine down, the same way I did my wiring. I just followed my orange and blue wire right down behind the tail light. Right down behind my inaudible 00:08:05, my bumper beam. Now I could have went in or came out right here and over, but I didn't want that air line hose to show. So what I did is brought it in back behind this and when across the top of my six pole plug and plugged it in and hooked it right into the airline fitting.You're gonna see a little grommet here in the . it's a little bit off to the left of your brake pedal, up on the far wall. It's real soft. The hole's covered. It's a pretty big hole so you're not gonna need all of it, just enough to get that air line tube through. If you cut the end of the air line tube in a point, you can actually poke the air line tube right through both of them and that's gonna come out on the far wall in the engine compartment. You wanna leave a little bit inside because you're gonna need to run a brown wire, the brown wire that comes in your kit, you can tape it on and then as you're running it trough, it'll pull your brown wire outside. This is going to connect to the orange and black wire and then your fuse holder and into the positive side of your battery, which we will do last.Get both of those running through, and then what you're gonna do is, you're gonna go back outside into the engine compartment. When you pull you're air line tube, you're gonna run it right up. It goes straight down like this. It's gonna go down underneath your brake booster, is where that grommet comes through the firewall. Pull it up, get your brown wire pulled up, just make sure you don't pull your brown wire all the way through or your air line tube. We'll just leave that hang for now.Next, we're gonna mount the actuator. This is what applies the break when air pressure is sent in from the vacuum line through the operating unit, through your air out. It's gonna fill the cylinder, in turn applying the break. It's gonna pull this wire that is connected to this bracket, that is mounted to the fire wall. Now there's a large self tightening screw that comes in the kit. You wanna make sure that you get that mounted to the firewall and make sure you have a little bit of play in your line so that your brake is not being applied all the time. Now to get this mounted on the brake pedal, because our break pedal arm is so wide, we're gonna need longer bots. Now these do not come in the kit, but you can find them here at etrailer.com.Next, this read 00:10:36 switch. This is a good idea to mount this thing on your cylinder before you mount it. It makes it a lot easier because the little bitty tiny screw, flat- headed screw over here that holds it in place. Off your read switch, you're gonna have three wires, blue, black and brown. Brown wire that we fed outside is gonna get mounted to the brown wire off the read switch. Black and blue, we'll worry about them in just a little bit.Next your gonna mount your indicator light. You can see here, we typically will like to mount them on the back of the rear view mirror because they're easier to see from the rear camera on the coach when the vehicle's being flat towed. You apply the brakes, when the brake's applied, the read switch is gonna be connected to this and this light is gonna come on. This is an LED strip, so it is very bright. I ran my wire up, underneath my headliner, over to my A pillar. I pulled my A pillar out. There is an airbag in here, so you wanna make sure that you pull that out enough when you're running that wire. You run it underneath the airbag and not over the top of it.Once you get this out and the wire ran through there, pop that back into place, and you can run the wire right down inside of this weather strip. This panel just pops right off. This panel pops off, but it has to come off after this one comes of. This pops straight out. This one pops out this way. Then I'm gonna wire it down and across and actually inside. Heres my wire that I ran back behind. There's a connection point right here on this small panel. You've gotta make sure you don't get your wire crossed in there, so it doesn't get pinched. Then I ran it down. It comes right out underneath this driver side kick panel. On the end of that you're gonna have a black wire and a red wire. These two wires are gonna get connected to the black wire and the blue wire coming off your read switch.The reason I have not made these connections yet is because our customer is getting the wireless, Demco's wireless coach link, which has to be wired in with these two. If you're not getting the coach link or you're not putting the coach link on, again, your gonna connect black to blue and red to black. Keep in mind that your black to blue does have to have a ground coming off it also. So you will actually have a second wire coming off one side and you will have to ground it somewhere to the body.For our ground wire, we're gonna cut the sides at our ring terminal. I'm gonna mount it right up here on the firewall, right next to that rubber grommet that does outside. Use a self tapping screw. And it might be easier, like I have here to go ahead and do the hole first. There you can see, it can be a pain in the but to try to keep that wire on there.Next, a couple things you're gonna need, a fuse holder, a fuse and another heat shrink butt connector. Take our orang wire with our black stripe coming from our breakaway switch. Gonna run my brown wire down, cut it to the same length as your orang and black wire. And you see how I'm holding them here. My brown wire runs this way and into the car. Orange and black wire runs this way down to the front of the car. And you see how I have them like this, give yourself enough that you can tuck that down there out of the way. We're gonna strip back both of these. Burn them together. Add on your heat shrink butt connector.I'm gonna take our fuse holder, make sure that the fuse is not in here. Cut it in half, strip back one end. Add it to the blue butt connector and we'll add our ring connector on this end and add it to the positive side of the battery. The reason we wanna do this last, the very last thing we do is make this connection and add on our fuse is because we have to make sure that our read switch on the inside of the vehicle, has all the wires connected before this connection is made, otherwise it's gonna send back feed to that switch and it could blow the switch. So, make sure we add . you do this part. It's the very last thing you do.Ring terminal, ten millimeter socket, loosen this nut. Make sure it's this one and not this one. Make that connection, reinstall your nut. Once you have that connected, you can add your fuse that comes with it.Once you've got all you're wires connected, connected to the battery, go ahead and clean up your install. Your kit's gonna come with some wire loom 00:15:43. You see here, I just covered up my colored wires so it makes the engine compartment look nice and clean. Go ahead and reinstall any panels you may have removed. You're gonna reinstall them in reverse order from the way you took them off.We need to find a place or a location to mount our supply unit. Normally we like to find one of these container boxes and mounted on the back of it or the side of it. You can see here, this one's got plenty of room in it. I mounted mine up high. We do have an exhaust outpour here, but I have it up hight enough that all my lines are up high and it's gonna stay away from the heat. So just make sure where ever you mount it, mount it away from heat or anything moving.The next thing we need to do, is we need to determine your supply line and your metered air line on your motor. You notice this T fitting here This is gonna be your metered air. It's gonna run from the bottom of this top unit, around to the side of this bottom unit. And you see the T fitting This T fitting's gonna come in your kit. You're gonna cut the line. You wanna make sure that the ends are clean before you insert them into your T Fitting to prevent any air leaks. Your gonna take the excess air line tube that comes in your kit. You're gonna put it into the T, or the outlet here. You're gonna route it. I route mine over top of my axle. I followed my existing lines right along the frame rail, right along here, around the bottom. Your metered air is gonna go in the port in between this lower unit and that tank. There's a port right there you can see that line.Next is gonna be our supply line. You can see this large green air line. It's coming out of the side of this unit here. You can see the large T fitting that has been installed. You're gonna install that they same way as we did this one. Make sure your tubes are clean before you insert them in there and before you cut that line you wanna make sure you empty all the air out of the lines. How you do that is, you get inside the RV, press on the brakes until the tanks are empty. Cut the line, clean off the edges, insert them in, and then you're gonna insert your air line tube. So you're gonna be running back to the take you installed. And I ran this one the exact same way I ran this one. Followed all the existing wires, over top my axle, right along the frame rail, right down like this, and it goes into the tank at the top.This is gonna be your supply line here.Next you're gonna take the rest of your air line, you're gonna put it in the bottom of this, right at the bottom of this unit. I ran mine across, over to the frame rail on the vehicle, right along the frame rail, put a zip tie here to hold it in place, ran across the top of my hitch, underneath. Then you need to mod you're L bracket with your air fitting on it. This vehicle has a brake that had the seven pole plug already mounted on it. So I just utilized that because if you try to go into here, there's actually a brace or a piece of steel that runs right across and along the back here and you can't get in here to put a nut on it. So, you wouldn't be able to mount it there. So I mounted it here. It's gonna come with the nuts and bolts, hardware to put it in. It's all in one place. It looks nice like that.Once you get that mounted, I ran the air line across. You're gonna make sure it's not a big kink in it. That's why I went this way. Plus it's not gonna interfere with my safety chains. Hook it right in to the back of it. You're ready to test everything out.That'll do it for our look at an installation on the SMI Air Force One Supplemental braking system, part number SM99243 on our 2019 Jeep Cherokee.


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