Hydraulic Control Assembly - Antilock Brakes: Service and Repair
Brake Pressure Modulator Valve (BPMV) Replacement (CTS)
Caution: Refer to Brake Dust Caution in Service Precautions.
Removal Procedure
Caution: For safety reasons, the brake pressure modulator valve assembly must not be repaired, the complete unit must be replaced. With the exception of the EBCM, no screws on the brake pressure modulator valve assembly may be loosened. If screws are loosened, it will not be possible to get the brake circuits leak-tight and personal injury may result.
1. Turn OFF the ignition.
2. Thoroughly clean all contaminants from around the EBCM.
Important: The area around the electronic brake control module (EBCM) must be free from loose dirt to prevent contamination of disassembled ABS components.
3. Remove the 2 master cylinder brake pipes (3) from the BPMV (1).
Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:
^ Eye contact-rinse thoroughly with water.
^ Skin contact-wash with soap and water.
^ If ingested-consult a physician immediately.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Service Precautions.
Important: Record the location of all brake pipes to the brake pressure modulator valve (BPMV) for use as an aid during installation.
4. Remove the 4 wheel brake pipes (2) from the BPMV (1).
5. Clean any brake fluid spillage from the BPMV (1).
6. If equipped with a brake fluid pressure sensor (4), disconnect the electrical connector, from the brake fluid pressure sensor.
7. Rotate the EBCM connector tab (2) up to the unlocked position.
8. Disconnect the EBCM electrical connector (1) from the EBCM (3) and position out of the way.
Notice: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.
9. Remove the 2 BPMV bracket nuts (2).
10. Remove the EBCM/BPMV assembly (1) from the BPMV bracket.
11. Remove the 4 EBCM to BPMV screws.
12. Clean the surface of the EBCM/BPMV assembly.
13. Remove the EBCM (1) from the BPMV (2).
Installation Procedure
1. Clean the seal surface of the BPMV.
2. Install the EBCM (1) to the BPMV (2).
3. Make sure that the internal pump motor connector (3) is installed into the new EBCM (1) prior to EBCM replacement.
4. Install the 4 EBCM to BPMV screws.
Tighten the EBCM to BPMV screws in sequence (1-4) to 5 Nm (44 inch lbs.).
Notice: Refer to Fastener Notice in Service Precautions.
5. Install the EBCM/BPMV assembly (1) to the BPMV bracket.
Important: Make sure that the rubber isolator is installed on the BPMV. The isolator protects the EBCM/BPMV assembly from vehicle vibrations.
6. Install the 2 BPMV bracket nuts (2).
Tighten the BPMV nuts to 10 Nm (89 inch lbs.).
7. Connect the EBCM electrical connector (1) to the EBCM (3).
Notice: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.
8. Rotate the EBCM connector tab (2) to the locked position.
9. Install the 4 wheel brake pipes (2) to the BPMV (1) using the locations recorded during the removal procedure.
Tighten the wheel brake pipes to 27 Nm (20 ft. lbs.).
Caution: The brake pipes must be fully installed to the brake pipe mounting retainers on the frame. Failure to properly retain the brake pipes may cause the pipes to contact the frame and/or the transmission resulting in possible loss of brake fluid and personal injury.
Caution: Make sure brake pipes are correctly connected to BPMV. If brake pipes are switched by mistake Inlet vs. Outlet, wheel lockup will occur and personal injury may result.
Important: If a new BPMV is being installed, remove the shipping plugs from the valve openings.
10. Install the 2 master cylinder brake pipes (3) to the BPMV (1) using the locations recorded during the removal procedure.
Tighten the master cylinder brake pipes to 27 Nm (20 ft. lbs.).
11. If equipped with a brake fluid pressure sensor (4), connect the electrical connector.
12. Fill and bleed the hydraulic brake system.
13. Perform the Auto Bleed Procedure. Refer to ABS Automated Bleed Procedure.
14. Perform the System Check-Vehicle. Refer to Diagnostic System Check - Vehicle.