Brake Pressure Modulator Valve Replacement (With JL4)

Brake Pressure Modulator Valve Replacement (With JL4)

Removal Procedure
Warning: Refer to Brake Fluid Irritant Warning (Brake Fluid Irritant Warning).


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.




1. Turn the ignition switch to the OFF position.
2. Remove the cover from the engine control module (ECM) and transmission control module (TCM), if equipped.
3. Clean the electronic brake control module (EBCM) to brake pressure modulator valve (BPMV) area of any accumulated dirt and foreign material.
4. Disconnect the electrical connector from the EBCM.
5. Disconnect the LR brake pipe fitting (1) from the BPMV.
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
6. Disconnect the RR brake pipe fitting (2) from the BPMV.
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.




7. Disconnect the LF brake pipe fitting (1) from the BPMV.
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
8. Disconnect the RF brake pipe fitting (2) from the BPMV.
Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.




9. Disconnect the master cylinder primary brake pipe fitting (1) from the BPMV.
Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
10. Disconnect the master cylinder secondary brake pipe fitting (2) from the BPMV.
Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.




11. Remove the BPMV bolt (1).




12. Carefully remove the BPMV (1) from the BPMV bracket insulators by pulling straight upward.
Do not pry against the accumulator covers on the underside of the brake modulator assembly to release the mounting pins from the bracket insulators.
13. If installing a new BPMV, remove the EBCM. Refer to Electronic Brake Control Module Replacement (With JL4) (Service and Repair)Electronic Brake Control Module Replacement (Without JL4) (Service and Repair).

Installation Procedure

1. If installing a new BPMV, install the EBCM. Refer to Electronic Brake Control Module Replacement (With JL4) (Service and Repair)Electronic Brake Control Module Replacement (Without JL4) (Service and Repair).




2. Install the BPMV (1) to the BPMV bracket until the mounting pins are fully inserted in the bracket insulators.
3. If installing a new EBCM, install new O-ring seals.

Caution: Refer to Fastener Caution (Fastener Caution).




4. Install the BPMV bolt (1).

Tighten the bolt to 11 Nm (97 lb in).




5. Connect the master cylinder primary brake pipe fitting (1) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).

6. Connect the master cylinder secondary brake pipe fitting (2) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).




7. Connect the LF brake pipe fitting (1) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).

8. Connect the RF brake pipe fitting (2) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).




9. Connect the LR brake pipe fitting (1) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).

10. Connect the RR brake pipe fitting (2) to the BPMV.

Tighten the fitting to 19 Nm (14 lb ft).

11. Connect the electrical connector to the EBCM.
12. Install the cover to the ECM and TCM, if removed.
13. Bleed the hydraulic brake system. Refer to Hydraulic Brake System Bleeding (Manual) (Service and Repair)Hydraulic Brake System Bleeding (Pressure) (Service and Repair)Hydraulic Brake System Bleeding (Rear Brake Caliper - Cobalt SS) (Service and Repair).
14. Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview).
15. Observe the brake pedal feel after performing the diagnostic system check. If the pedal now feels spongy, air may have been in the secondary hydraulic circuit of the brake modulator which may have been introduced into the primary circuit. If the pedal feels spongy, perform the Antilock Brake System Automated Bleed Procedure (Service and Repair).