Removal Procedure
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
The high pressure accumulator (HPA) and the chambers of the brake modulator assembly to which it attaches, store brake fluid at extremely high pressures. Fluid pressure must be relieved before attempting to service the HPA. Ensure that the recommended procedures are followed to relieve system pressure, including using the manual pressure release steps. Failure to properly follow procedures to depressurize the system may result in personal injury.
WARNING:
Refer to Brake Fluid Irritant Warning
.
CAUTION:
Refer to Brake Fluid Effects on Paint and Electrical Components Caution
.
CAUTION:
Always connect or disconnect the wiring harness connector from the EBCM/EBTCM with the ignition switch in the OFF position. Failure to observe this precaution could result in damage to the EBCM/EBTCM.
NOTE:
The ignition must be in the OFF position, without pausing at ACCESSORY, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1-3 minutes.
- Turn the ignition to OFF, without pausing at ACCESSORY, and without applying the brake pedal.
Remove the ignition key.
- Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
- Remove the antilock brake system (ABS) module splash shield retainer (1).
- Remove the ABS module splash shield bolts (1).
- Remove the ABS module splash shield (1).
- Clean all dirt and debris from the brake pressure modulator valve (BPMV) assembly and the brake pipe fittings.
- Loosen the brake modulator manual pressure relief valve (1) 1/4 turn counterclockwise.
- Seat, but do not tighten, the manual pressure relief valve.
- Disconnect the electronic brake control module (EBCM) electrical connector.
- Disconnect the BPMV supply hose quick connect (1).
Cap the BPMV inlet port and plug the supply hose to prevent brake fluid loss and contamination.
- Disconnect the BPMV return hose quick connect (1).
Cap the BPMV outlet port and plug the return hose to prevent brake fluid loss and contamination.
- Disconnect the right rear brake pipe fitting (1).
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
- Disconnect the left rear brake pipe fitting (2).
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
- Disconnect the primary brake pipe fitting (1).
Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
- Disconnect the right supply brake pipe fitting (1).
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
- Disconnect the left supply brake pipe fitting (2).
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
- Through the frame crossmember, remove the BPMV bracket bolts (1).
- Loosen, but do not remove, the lower BPMV bracket bolt (1).
- Slide the EBCM/BPMV and bracket assembly (1) toward the center of the vehicle and remove the assembly from the vehicle frame.
- Place the EBCM/BPMV and bracket assembly on a clean work surface.
- Remove the BPMV bolts (1).
- Remove the BPMV assembly from the bracket (1).
- Remove the sleeves and insulators from the BPMV, if necessary.
- If replacing the BPMV, loosen but do not remove the EBCM bolts (1).
- Using the loosened bolts as a guide, carefully pull the EBCM (1) evenly from the BPMV to release the electrical connectors.
- Remove the EBCM bolts (1).
- Remove the EBCM (1).
NOTE:
To ensure brake modulator and HPA pressure relief has occurred, the manual pressure relief valve must be opened momentarily.
NOTE:
Do not pry the EBCM from the BPMV. The EBCM must be pulled back evenly.