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Home >> Buick >> 2003 >> LeSabre V6-3.8L VIN K >> Repair and Diagnosis >> Brakes and Traction Control >> Hydraulic System >> Hydraulic Control Assembly - Antilock Brakes >> Service and Repair >> Brake Pressure Modulator Valve (BPMV) Replacement

Brake Pressure Modulator Valve (BPMV) Replacement























Brake Pressure Modulator Valve (BPMV) Replacement

Caution: Refer to Brake Fluid Irritant Caution in Cautions and Notices.

Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Cautions and Notices.

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. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Remove the left front wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
4. Remove the left front wheelhouse extension. Refer to Fascia Extension Replacement - Front in Bumpers.

Important: The area around the electronic brake control module (EBCM)/brake pressure modulator (BPMV) must be free from loose dirt to prevent contamination of the disassembled ABS components.

5. Thoroughly wash all contaminants from around the EBCM/BPMV.
6. Rotate the EBCM connector tab up to the unlocked position.
7. Remove the EBCM connector position assurance (2) from the EBCM electrical connector (1).

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. Disconnect the EBCM electrical connector (1) from the EBCM (4).

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: When removing the brake pressure modulator valve, protect the vehicle exterior from possible brake fluid spillage. Brake fluid can cause damage to painted surfaces.

Notice: Excessive bending of brake pipes during BPMV removal or installation may cause permanent damage that will require replacement.

Important: Record the location of all brake pipes to the BPMV for use as an aid during installation.

9. Remove the 2 master cylinder brake pipes (1) from the BPMV (2).
10. Remove the 4 wheel brake pipes (1) from the BPMV (2).
11. Clean any brake fluid spillage from the BPMV (1).
12. Remove the 2 BPMV bracket nuts (2).
13. Remove the EBCM/BPMV assembly (1) from the BPMV bracket (3).
14. Disconnect the BPMV electrical connector (2) from the EBCM (3).
15. Remove the 6 EBCM to BPMV screws (2).
16. Clean the surface of the EBCM/BPMV assembly.

Important: The EBCM cannot be repaired. If faulty, the unit must be replaced.

17. Separate the EBCM (2) from the BPMV (1).

Installation Procedure

1. Clean the seal surface of the brake pressure modulator (BPMV).
2. Install the electronic brake control module (EBCM) (2) to the BPMV (1).

Notice: Refer to Fastener Notice in Cautions and Notices.

3. Install the 6 EBCM to BPMV screws (2).
Tighten
Tighten the 6 screws to 3.2 N.m (28 lb in).
4. Connect the BPMV electrical connector (2) to the EBCM (3).

Important: Make sure that all 3 rubber isolators are installed on the BPMV. The isolators protect the EBCM/BPMV assembly from vehicle vibrations.

5. Install the EBCM/BPMV assembly (1) to the BPMV bracket (3).

Notice: Refer to Fastener Notice in Cautions and Notices.

6. Install the 2 BPMV bracket nuts (2).
Tighten
Tighten the 2 nuts to 10 N.m (89 lb in).

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.

7. Install the 4 wheel brake pipes (1) to the BPMV (2) using the locations recorded during the removal procedure.
Tighten
Tighten the 4 brake pipes to 15 N.m (11 lb ft).
8. Install the 2 master cylinder brake pipes (1) to the BPMV (2) using the locations recorded during the removal procedure.
Tighten
Tighten the 2 brake pipes to 15 N.m (11 lb ft).

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. Connect the EBCM electrical connector (1) to the EBCM (4).
10. Install the EBCM connector position assurance (2) to the EBCM electrical connector (1).
11. Rotate the EBCM connector tab (2) down to the locked position.
12. Install the left front wheelhouse extension. Refer to Fascia Extension Replacement - Front in Bumpers.
13. Install the left front wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
14. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
15. Fill and bleed the hydraulic brake system. Refer to Master Cylinder Reservoir Filling and Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes.
16. Perform the Auto Bleed Procedure. Refer to ABS Automated Bleed Procedure.
17. Perform the ABS Diagnostic System Check. Refer to Diagnostic System Check - ABS. Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure) Master Cylinder Reservoir Filling
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