Hydraulic Control Assembly - Antilock Brakes: Service and Repair

HCU (HYDRAULIC CONTROL UNIT)

REMOVAL





1. Clean off the top of the HCU, especially around the hydraulic lines (1-6). Be sure there is not any debris that could fall into the brake line holes.

Note: To aid in reassembly, insure the hydraulic brake lines and corresponding connections at the HCU are clearly marked before disassembly.

2. Remove the hydraulic lines from the HCU. Seal off the hydraulic lines and connections with suitable plugs.
^ Right rear wheel (1)
^ Master cylinder front (2)
^ Right front wheel (3)
^ Left front wheel (4)
^ Left rear wheel (5)
^ Master cylinder rear (6)





3. Disconnect the hydraulic controller unit harness connector (1) from the CAB.
4. Remove the HCU upwards, by carefully pushing the hydraulic lines to one side and carefully pull up.

INSTALLATION





1. Inspect the seating and condition of the rubber grommets and replace if necessary.

CAUTION: Use caution when re-connecting hydraulic lines. Refer to markings for proper installation. If necessary, trace the line routing to the corresponding wheel.

2. Install the brake lines (1-6). Pay very close attention to the locations when installing the hydraulic lines. DO NOT cross thread.
^ Right rear wheel (1)
^ Master cylinder front (2)
^ Right front wheel (3)
^ Left front wheel (4)
^ Left rear wheel (5)
^ Master cylinder rear (6)





3. Connect the hydraulic control unit harness connector (1) to the CAB.
4. Bleed the brake system.
5. Connect the DRBIII and read any DTCs, then clear any applicable codes.