Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Get automatic, real-time braking in your towed Fiat 500 with the InvisiBrake. Actuator box installs permanently so that you never have to remove, adjust or reactivate. System connects to RV and engages car brakes when the RV brake lights illuminate.
Wire the InvisiBrake into your Fiat 500, connecting it to the battery and electrical harness, and you never have to remove it. When you're ready to tow your car, just connect the it to your RV via the included electrical cable, and the system is ready to go.
The InvisiBrake is designed to activate the brakes in your towed car upon receiving a signal from your RV that the motor home's brakes have been applied. This signal is sent via the wiring harness whenever the RV's brake lights are illuminated. This way, you get real-time braking action, ensuring that your towed car brakes at the same time and for the same duration as the brakes in your RV. In addition, there will be no false braking when you hit bumps or potholes.
Adjustable Pressure Settings
The braking pressure of the InvisiBrake can be adjusted from 5 psi to 80 psi depending on your individual application and preferences. Typically, a braking system has to apply an extreme amount of force to activate the towed car's brakes because the vacuum-assist function of the brakes is not active when the ignition is off. This excessive pressure would cause damage to your car if it had "active" brakes. Because this system lets you adjust the braking pressure to a comparatively minimal amount, you can use it on automobiles that have continuous-power-assist brakes, such as Hummers and hybrids, without having to worry about any potential damage.
The pressure setting needs to be adjusted only once, during the initial installation, at which point you can test the system at different settings to determine which feels best. Once the setting is determined, it does not have to be readjusted, so your system is always ready to go.
Permanent, Out-of-the-Way Installation
Most often, the InvisiBrake actuator box installs beneath the front seat of your towed car, neatly tucked away so that you won't see it and it won't take up any storage space in your Fiat 500. You can, however, install it anywhere in your towed car that is convenient for you, as long as you can still access the adjustment knob.
A bracket and cable pulley will install on the arm of your Fiat 500's brake pedal. This will not interfere with normal braking function and does not have to be adjusted, removed or activated. The entire system can stay in your car year 'round, waiting for those times when you need to tow. And once you do hook up your car to your RV in preparation for towing, the system will function automatically.
Video of Roadmaster InvisiBrake Supplemental Braking System
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today on our 2010, Hyundai Elantra, we will be installing the Roadmaster InvisiBrake, supplemental braking system; part number: RM-8700. Now, before beginning our installation, weve already gone ahead and removed the rear seat, the drivers seat and both the front trim, as well as the rear door trim. Weve already gone ahead and removed the left front tire, as well as the left front inner fender well. This will allow us access to the main wiring harness where it passes through into the passenger compartment. Now, as you can see here, weve got our InvisiBrake box set onto the floor of the vehicle, underneath where the drivers seat would be. Well find a good location, making sure that the bolts that we are going to use to hold the box down go through the floor and dont go through anything else underneath the vehicle.
Now, before mounting our box, well go ahead and plug in all of the connectors into the back. First, well plug in our four-pole harness here. Well then plug in the connector here, with the power and ground in it, as well as the breakaway switch wiring. Well then connect our air tube. Well use one of the two small vacuum tubes to connect the hard line to our InvisiBrake box.
Well slide the vacuum tube onto the box, then slide the hard tube into the vacuum tube. Well now take the small air tube and plug it into the back of the box. Now that we have all our connections made on the box, well go ahead and begin routine the wiring, as well as the hoses. Using this hole already cut in the carpet, well run it underneath the carpet, over to the drivers side door sill. Well now move to the drivers door sill here, where well take the small air tube and route it toward the drivers rear door sill.
Now that we have all our wiring and hoses ran, well now mount our InvisiBrake box. Well place it into position and using two of the self-tapping screws included with the kit, well screw it to the floor of the vehicle. Well go ahead and leave the air tube here for now where we can now route the rest of our wiring. Well bring it up the drivers side door sill underneath the dash. Now here, underneath the dash, well find where the main harness passes through to the outside of the vehicle.
Now were here in the drivers front wheel well and youll see here where the wiring harness passes through. We are going to go ahead and cut the slit here on the back side of the boot, just to offer a little more protection from the elements. Well now pass a piece of red air tube here as a pole wire through the boot into the vehicle. Well then attach our black air tube for the InvisiBrake to the red air tube that were using as a pole wire. Well pull it through the boot, where well now take the rest of our wires and attach it to the black air tube, using some electrical tape and then use it as a pull wire itself. Well bring all the wires through that are moving up to the front of the vehicle. Well also need to take the answerback wire for our RV and pass it through. Well bring it into the inside of the vehicle, attach it to the black air tube and again, using it as a pull wire, well pull it through the boot. We now have all our wires here on the outside of the vehicle in the drivers front wheel well area. Well now put our air cylinder into the vehicle and here, in the drivers front door, well need to find a good location for our pulley. Once we find a good location, well go ahead and peel the carpet back and expose the jute underneath. Well need to cut the jute so that we can mount the pulley to the firewall. Once we have cut the jute away, well use the included self-tapping screws and mount our pulley into place. Now, we want to keep the pulley at a slight angle so that our cable rides towards the center of the pulley. Well also want to make sure that we stay out of the way of the brake pedal, so that when its fully depressed, it doesnt come in contact with the pulley itself. Now, on this vehicle, it is a manual transmission, so we also want to make sure that we stay out of the way of the clutch pedal. Once it is secured, we will go ahead and attach our cable to the brake pedal. Well be using the L bracket and the straight bracket here with the two long bolts and nylon lock nuts. Well put the L bracket into position and slide the bolt through, passing it through the straight bracket on the other side. We can then put the nylon lock nuts on and repeat this same procedure, installing the other bolt. Youll notice that the two brackets have multiple holes drilled on one side. We want to make sure that when we pass the bolt through, we get as close to the brake pedal as possible. Well be using the closest two bolt holes to the brake pedal. Now that we have it loosely fitted to our brake pedal, we can go ahead and tighten them down, making sure that the bracket stays in line with the pulley mounted to the floor. With that done, we will pass the cable into the L bracket and go ahead and take the two nuts and secure it to the L bracket. With that done, we are ready to mount the cable to the floorboard. Now, included with the InvisiBrake kit is a small clamp and two self-tapping screws. Well find a good location for our cable and mount it to the floorboard. When we do this, youll want to make sure you take as much of the slack out of the cable as possible without pulling on the brake pedal itself. Now that our cable is attached to our brake pedal and secured to the floorboard, well walk the cable to the drivers rear door. Now, here is where were going to mount our cylinder. Well take the wire loom clamp, wrap it around our InvisiBrake air cylinder and using another of the self-tapping screws, well secure it to the floor of the vehicle. Now, the small air tube well route around and connect to the air cylinder. We can cut away any of the excess air tube, just giving it a cleaner look. Now that the air cylinder is in, that will complete the installation inside the vehicle so we can go ahead and reassemble the interior of our vehicle. Well replace the rear seat, the drivers seat and all the trim that we previously removed. Well now move back to the drivers front wheel well area, where well route the wiring, following the manufacturers wiring harness in the fender here. Well use some zip ties to make sure that it stays connected to the factory wiring harness. We can then pass it through the inner fender well into our engine compartment. Now, the four-pole as well as the answerback wire and the breakaway switch wiring, will all need to underneath the vehicle. So, well route it around, making sure to stay away from any hot components or moving components. The red and black wire that are connected together will be our battery positive and negative. So, well go ahead and route that to our battery and leave it sit for now. Well take the black air tube and route it towards our vacuum brake booster. Well now move underneath the vehicle where well need to connect our four-pole harness for the InvisiBrake to the four-pole harness for the rear lighting system. Well go ahead and cut the harness here for the lighting system and insert the four-pole harness for the Roadmaster InvisiBrake System. Well connect them color-for-color, white-to-white, green-to-green, yellow-to-yellow and brown-to-brown. Well now go ahead and find a suitable location for our breakaway switch. Now, on our particular vehicle, the best place that we found to mount it is right underneath the front bumper fascia. Well go ahead and remove one of the bolts holding the bumper fascia on. Well then need to cut away the plastic, using a RotoZip tool, so that we can mount our breakaway switch. With the plastic removed, well go ahead and put our breakaway switch into position and reinstall the bolt. Now that our breakaway switch is secured, well need to cut away a piece of the lower fascia to make it accessible to the breakaway switch wire that will run to the RV. Well again be using a RotoZip tool to cut away the bumper fascia. With that done, all we have left to do is connect the wiring to the breakaway switch and secure it underneath the vehicle. Now, for the answerback wire, well take one of these loom clamps and a self-tapping screw, and mount it underneath the bumper here on the front bumper fascia. Well again need to make sure that its accessible, so that you can plug in the wire running to the RV. With that done, well move up here to our air hose. Now, were going to go ahead and remove the upper air box, so that we can gain access to the vacuum hose running to the brake booster. Now, our vehicle already has a one-way check valve in the tube running to the brake booster. So, well go ahead and use it. Well remove the vacuum tube from the brake booster and using one of the two vacuum tubes that come with the Roadmaster InvisiBrake System, well attach it to the brake booster. Well then put in the T that well use to connect the black air tube. Well also want to make sure that the vacuum line that weve removed from the brake booster is secure and out of the way of anything that could cut it or pinch it. Well use a zip tie to attach it here to our throttle body, making sure it stays out of the way. Well now go ahead and cut off the excess of the air tube and using the other vacuum tube that comes with the InvisiBrake System, well attach one side to the T and the vacuum tube to the other side. We can then go ahead and reinstall our upper air box. Now that we have that done, well need to connect the powering ground for our InvisiBrake System. Well strip back the black wire, attach a ring terminal to it and attach the ring terminal to our batterys ground. Well then take the red wire, strip back the insulation and attach our fuse link here to it. Once weve done that, we can clip away the zip tie, grab our fuse open up the fuse holder, where well take the ring terminal and attach it to the positive side of our battery. We can then install our fuse, which will power up the InvisiBrake. With that done, our installation is complete and our InvisiBrake System is up and running; and that will complete our installation of the Roadmaster InvisiBrake Supplemental Braking System, part number RM-8700 on our 2010 Hyundai Elantra.
Average Customer Rating: 4.7 out of 5 stars (7 Customer Reviews)Get automatic, real-time braking in your towed vehicle with the InvisiBrake. Actuator box installs permanently so that you never have to remove, adjust or reactivate. System connects to RV and engages car brakes when the RV brake lights illuminate.
Installed in a 2014 CRV. Worst part was getting all the wiring and under the door sill trim panel and routed up through the firewall into the engine compartment, and getting the cable and pulley installed up to the brake pedal. Pretty crowded under the dash in a CRV (my ribs are still sore)! had to use a different clamp on the vacuum cylinder because I had to move it forward of where the video showed in order for the cable to reach the mounting location under the dash. Had to clamp it around the larger end of the cylinder and the supplied clamp would not fit around the larger diameter end. Maybe Roadmaster has shortened the cable? Haven't tested yet but have high hopes! I used the videos extensively, and couldn't have done it myself without them! Not bad for a 72 year old! 221175
by: Chris S06/09/2015
Again the etrailer video which I watched many times was very helpful. I did not want the controller installed under a seat so I installed it in the spare wheel well. See attached pictures. This required extending a couple of the supplied cables but that was easily done. Installation was long but went smoothly. I have yet to test it on the road behind my RV. 201945
by: Jeff M07/22/2015
As always the team at e-trailer rock, always over communicating tracking status and delivery of their products. And while doing this they can help with install questions and always provide links to the install guides and what not. Awesome work! 213630
by: Jack E.02/25/2014
Great product. I like this set up because I can now tow the jeep with any vehicle. I've towed many years without using auz. brakes but I decided I better get legal and it does break much better now! 117602
by: Jerry R.04/27/2015
Just used for the first time. So far so well. Very easy to set the unit pressure and test. Then it becomes a plug and play system. 188491
Great braking system. It should be recommended to purchase the wiring harness. It takes the Roadmaster harness to do it right. 94741
Works great, third one I have installed for family. Just time consuming if you do it neat. 184061
Ask the Experts about this Roadmaster Tow Bar Braking Systems
Do you have a question about this Tow Bar Braking System?
Info for this part was:
At etrailer.com 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.