Hydraulic Control Assembly - Antilock Brakes: Service and Repair
Brake Pressure Modulator Valve Replacement (CTS)
Caution: Refer to Brake Dust Caution.
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.
Important: The area around the electronic brake control module (EBCM) must be free from loose dirt to prevent contamination of disassembled ABS components.
2. Thoroughly clean all contaminants from around the EBCM.
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.
Important: Record the location of all brake pipes to the brake pressure modulator valve (BPMV) for use as an aid during installation.
Remove the 2 master cylinder brake pipes (3) from the BPMV (1).
3. Remove the 4 wheel brake pipes (2) from the BPMV (1).
4. Clean any brake fluid spillage from the BPMV (1).
5. If equipped with a brake fluid pressure sensor (4), disconnect the electrical connector, from the brake fluid pressure sensor.
6. Rotate the EBCM connector tab (2) up to the unlocked position.
Notice: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.
7. Disconnect the EBCM electrical connector (1) from the EBCM (3) and position out of the way.
8. Remove the 2 BPMV bracket nuts (2).
9. Remove the EBCM/BPMV assembly (1) from the BPMV bracket.
10. Remove the 4 EBCM to BPMV screws.
11. Clean the surface of the EBCM/BPMV assembly.
12. 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.
Notice: Refer to Fastener Notice.
4. Install the 4 EBCM to BPMV screws.
Tighten the EBCM to BPMV screws in sequence (1-4) to 5 N.m (44 lb in).
Important: Make sure that the rubber isolator is installed on the BPMV. The isolator protects the EBCM/BPMV assembly from vehicle vibrations.
5. Install the EBCM/BPMV assembly (1) to the BPMV bracket.
6. Install the 2 BPMV bracket nuts (2).
Tighten the BPMV nuts to 10 N.m (89 lb in).
Notice: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.
7. Connect the EBCM electrical connector (1) to the EBCM (3).
8. Rotate the EBCM connector tab (2) to the locked position.
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.
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 N.m (20 lb ft).
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 N.m (20 lb ft).
11. If equipped with a brake fluid pressure sensor (4), connect the electrical connector.
12. Fill and bleed the hydraulic brake system. Refer to Master Cylinder Reservoir Filling and Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Pressure).
13. Perform the System Check-Vehicle. Refer to Diagnostic System Check - Vehicle. Initial Inspection and Diagnostic Overview