The Controller Anti-Lock Brake CAB (Mark 20T or Mark 25T) is a microprocessor-based device which monitors the Antilock Brake System (ABS) and the Electronic Stability Program (ESP) during normal braking and driving functions. The CAB controls brake pressure when the vehicle is in an ABS stop or if the vehicle is in a spin. The CAB is mounted to the Hydraulic Control Unit (HCU) as part of the Integrated Control Unit (ICU). The CAB uses a 47-way electrical connector on the vehicle wiring harness. The power source for the CAB is through the 50 amp fuse located in the Engine Fuse Block.
Removal & Installation
- Before servicing the vehicle, refer to the Precautions Section.
- Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
Clean off the top of the HCU, especially around the hydraulic lines.
Be sure there is not any debris that could fall into the brake line holes.
NOTETo aid in reassembly, insure the hydraulic brake lines and corresponding connections at the HCU are clearly marked before disassembly.
- Be sure there is not any debris that could fall into the brake line holes.
Remove the hydraulic lines from the HCU in the following order and seal them off with suitable plugs.
Right rear wheel
- Disconnect the hydraulic controller unit harness connector from the CAB.
Remove the HCU upwards, by carefully pushing the hydraulic lines to one side and carefully pull up.
Inspect the seating and condition of the rubber grommets and replace if necessary.
WARNINGUse caution when re-connecting hydraulic lines. Refer to markings for proper installation. If necessary, trace the line routing to the corresponding wheel.
Install the brake lines in the following order. Pay very close attention to the locations when installing the hydraulic lines and be careful to not cross-thread the fittings.
Right rear wheel
- Connect the hydraulic control unit harness connector to the CAB.
- Bleed the brake system.
- Connect the DRB IIIT and read any DTCs and clear any applicable codes.