Wiring the Roadmaster InvisiBrake on a 2026 Ford Maverick
Updated 08/11/2026 | Published 07/30/2026
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Question:
Does the Braking Monitor/Alarm Kit use the blue wire for the factory brake controller and does the brake controller need to be disconnected to keep it from interfering with the signal light and speaker?
asked by: Jason
Expert Reply:
Glad you reach out Jason, happy to help!
The good news is you don't need to disconnect your factory brake controller. The Roadmaster InvisiBrake # RM-8700 does not use the vehicle's blue trailer brake controller wire, so the two systems operate independently.
The InvisiBrake's monitor system connects to the cold side of the brake light switch in the towed vehicle. When the InvisiBrake applies the brakes, the brake light switch sends a signal to the monitor LED and alarm in the motorhome.
The monitor wire runs between the towed vehicle and the motorhome, either through the included monitor wire or an unused terminal in your existing electrical connector and the LED/audio monitor is grounded to the motorhome chassis.
Since this is a separate circuit from the electric trailer brake controller, the two systems do not interfere with each other.
Are you installing the InvisiBrake on a new flat-tow setup, or are you replacing an existing supplemental braking system?
Product Page this Question was Asked From
Roadmaster InvisiBrake Flat Tow Brake System - Preset
- Flat Tow Brake System
- Brake Systems
- Pre-Set System
- One-Time Setup
- Vehicle Battery
- Fixed System
- Power Assist Brake Compatible
- Air Brakes
- Hydraulic Brakes
- Indicator Lights
- Roadmaster
more information >
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on Flat Tow Brake System
Joe M.
8/9/2026
You run a separate wire from the towed vehicles brake lights (on the side of the diode not connected to the towing vehicle) or from the brake switch attached to the foot pedal in the towed vehicle. This wire runs all the way back to the monitor kit installed in the dash of the towing vehicle. The LED just shows that the towed vehicles brake peddle is engaged and the alarm sounds if it is engaged for an extended period of time. It does not interface with a brake controller, if installed, in the towing vehicle. In fact the invisibrake system as whole does not require or utilize a brake controller. It utilizes the brake light signal from the towing vehicle to know when to apply the brakes in the towed vehicle. There are a few downsides to this approach, but many of the towed braking systems work this way. First downside is that for most of these the brakes aren't proportional. Some use an inertia sensor in addition to the brake light signals but unless it specifically calls out proportional braking as a feature, it almost certainly isn't. For most, if the brake lights are on on the towing vehicle, the brakes are applied at a constant pressure either continuously or in the case of the invisibrake, there is a preset time limit after which the brakes are supposed to disengage. The second notable drawback is that the invisibrake can't tell the difference between braking and hazard flashers. So for instance if you're climbing a steep hill and turn on your flashers because you're going slower than other traffic, the invisibrake will "flash" the brakes with the hazard flashers. The remote monitor/alarm is not absolutely necessary. The braking system will function without it. However, it is nice to get feedback that the brakes are actually being applied and just as importantly that they are being released. I've had a few times where the toad's battery has died while towing and it was useful to not see the brakes engaging when that happened.