Hydraulic Control Assembly - Antilock Brakes: Service and Repair

Brake Pressure Modulator Valve Replacement

Removal Procedure

Caution: Refer to Brake Fluid Irritant Caution.

1. Caution: Refer to Battery Disconnect Caution.

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

Remove the negative battery cable.





2. Important: The area around the electronic hydraulic control unit (EHCU) MUST be free from loose dirt to prevent contamination of disassembled ABS components.

Thoroughly wash all contaminants from around the EHCU.
3. Disconnect the chassis electrical harness connectors from the electronic brake control module (EBCM).

4. Important: Make sure that brake lines are tagged and kept in order for proper reassembly.

Disconnect 5 brake lines from the brake pressure modulator valve (BPMV).
5. Remove the bolts (4) securing the EHCU mounting bracket (3) to the frame rail (5).
6. Remove the EHCU assembly (1) from the vehicle.





7. Remove the bolts (4) securing the BPMV mounting bracket (5) to the BPMV (3).
8. Disconnect the 2-way ABS pump motor connector.
9. Remove the bolts (1) from the EBCM (2).

10. Notice: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.

Important: Do not reuse the EBCM mounting bolts. Always install new bolts.

Remove the EBCM (2) from the BPMV (3). Removal may require a light amount of force.
11. Clean the EBCM to BPMV mounting surfaces with a clean cloth.

Installation Procedure





1. Important: Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.

Install the EBCM (2) onto BPMV (3).

2. Important: Do not reuse the old mounting bolts. Always install new bolts with the new BPMV.

Install the 4 EBCM bolts.
Tighten the 4 bolts to 5 Nm (39 inch lbs.) in an X-pattern.
3. Connect the 2-way ABS pump motor connector to the EBCM.
4. Install the BPMV (3) to BPMV bracket (5).
5. Install the BPMV to bracket retaining bolts (4).
Tighten the bolts to 9 Nm (7 ft. lbs.).





6. Install the EHCU assembly (1, 2) to the vehicle frame (5).
Tighten the 3 EHCU bracket bolts (4) to 25 Nm (18 ft. lbs.).
7. Connect the chassis electrical harness connectors to the EBCM (1).

8. Important: The brake pipes are held in the proper place by a frame mounted plastic bracket. Make sure that the brake pipes stay in the correct place for proper reassembly.

Install the 5 brake pipes to the BPMV (6).
Tighten the brake pipe fittings to 25 Nm (18 ft. lbs.).
9. Connect negative battery cable.
10. Bleed the brake system. Refer to Antilock Brake System Automated Bleed Procedure.