Roadmaster's InvisiBrake 8700 wiring chart connects the towed vehicle's lighting signals to the controller, brakeaway switch and battery, with protected diode circuits at the rear lamps. This guide separates the electrical connections from the new-car reinstallation kit 98700 and second-motorhome monitor kit 98850.
Original Roadmaster components and installation drawings
The manufacturer diagrams show the components and connection points for this system. Open each PDF for a larger view and the complete service instructions.
InvisiBrake 8700 original battery, breakaway and lighting wiring
Open the Roadmaster PDF to enlarge the labelled components and connections.
Open invisibrake 8700 original battery, breakaway and lighting wiring (PDF)
98700 new-car kit illustrated major components
Open the Roadmaster PDF to enlarge the labelled components and connections.
New-car kit wiring diagram
Open the Roadmaster PDF to enlarge the labelled components and connections.
Original Roadmaster parts and reference numbers
These factory references identify the system's original pieces. Unlinked entries are not represented as individually stocked NewRVParts replacement parts.
| Reference | Roadmaster number | Component | Shop |
|---|---|---|---|
| Kit | 98700 | InvisiBrake replacement/new-car installation kit | View exact part |
| System | 8700 | Complete InvisiBrake supplemental system | View exact part |
| Monitor kit | 98850 | Second-motorhome LED/alarm installation kit | View exact part |
| 1 | 452104-10 | Pulley included in illustrated new-car components | |
| 2 | 452140-00 | Cable anchor bracket | |
| 3 | 945202-00 | Brake pedal clamp | |
| 4 | 450008-15 | 15-foot towed-car monitor wire | |
| 5 | 945203-00 | Breakaway, power and ground harness | |
| 6 | 650898 | Breakaway switch and activation pin | |
| 6 spare | 200200-20 | Replacement breakaway pin | |
| 7 | 452141 | 3/8-inch vacuum check valve | |
| 7 alt | 452142 | 1/2-inch vacuum check valve | |
| 8 | 450701 | 1/8-inch pneumatic tubing | |
| 9 | 450700 | 1/4-inch nylon vacuum tubing | |
| 10 | 452111 | 1/4-inch rubber vacuum hose | |
| 11 | 452137 | 3/8-inch vacuum hose | |
| 12 | 452136 | 1/2-inch vacuum hose | |
| 13 | 452118 | 3/8-inch vacuum-line tee | |
| 14 | 452116 | 1/2-inch vacuum-line tee | |
| 15 | 945204-00 | Four-wire towed-lighting harness | |
| 16 | 650900-20 | 20-foot breakaway harness | |
| Additional | 452143 | 1/4-inch check valve if sharing controller between two vehicles | |
| Additional | 452109-20 | Additional air cylinder required for controller sharing | |
| Additional | 452109 | Additional brake cable assembly for controller sharing | |
| Option | 88400 | Brake-Lite relay kit for vehicle-specific stop/turn wiring conflicts | View exact part |
Related NewRVParts products with photographs
Check each product's full manufacturer number and package contents. Complete systems, transfer kits, motorhome accessories and individual service parts are sold in different configurations.
Confirm the correct braking system
The Roadmaster 98700 kit is intended for transferring an existing InvisiBrake to another towed vehicle. If owners plan to move the controller between two prepared cars, the manufacturer also specifies additional check valve 452143, air cylinder 452109-20 and cable assembly 452109. The 98850 kit fits the motorhome-side monitor, not the towed-car brake cylinder. A Brake-Lite relay is only appropriate when required by the vehicle's lighting configuration.
Find Roadmaster's current installation and service manuals