Electronic Brake Control Module: Service Precautions

The Controller Anti-Lock Brake (CAB) is mounted to the bottom of the Hydraulic Control Unit (HCU). Therefore, it is important to observe the following HCU precautions and service notes.

CAUTION:
- Do not apply a 12 volt power source to any terminals of the 25 way HCU connector when disconnected.
- Before removing the brake tubes from the HCU, the HCU must be thoroughly cleaned. This must be done to prevent dirt particles from falling into the ports of HCU or entering the brake tubes.
- The HCU mounting bracket to front suspension cradle mounting bolts have a unique corrosion protection coating and a special aluminum washer. For this reason, only the original, or original equipment Mopar replacement bolts can be used to mount the HCU bracket to the front suspension crossmember.
- Because of the flexible section in the primary and secondary brake tubes, and the brake tubes between the HCU and the proportioning valve, the brake tubes must be held in proper orientation when tightened and torqued. These tubes must not contact each other or other vehicle components when installed.

Brake Tube Connections To HCU:

- When installing the chassis brake tubes on the HCU valve block, they must be located correctly in the valve block to ensure proper ABS operation. Refer to above image for the correct chassis brake tube locations.

NOTE:
- The chassis brake tube attachment locations to the HCU are marked on the bottom of the HCU mounting bracket.
- Before installing the 25 way connector in the CAB, be sure the seal is properly installed in the connector.