Hydraulic Control Assembly - Antilock Brakes: Service and Repair

Brake Pressure Modulator Valve Assembly Replacement

Removal Procedure





Caution: Refer to Battery Disconnect Caution Battery Disconnect Caution in Cautions and Notices.

1. Disconnect the negative battery cable.
2. Drain the engine coolant and remove the engine coolant reservoir tank.
3. Disconnect the wiring harness connector at the 31-pin antilock brake system (ABS) from the socket on the electronic brake control module (EBCM).
4. Cover the connector and the socket with shop cloths to protect the components from brake fluid.





Notice: Take care not to allow air into the hydraulic unit or into the brake pipes from the master cylinder. If air gets into the hydraulic unit, it will require a bleeding procedure using a scan tool programmed for the ABS 5.3 system. As long as no air enters the hydraulic unit, a simple bleeding procedure is all the system will require.

5. Remove the brake pipes from the hydraulic unit. You may have to loosen the brake pipe nuts on the master cylinder to allow for moving those pipes out of the way.
6. Loosen the mounting nuts on the hydraulic unit.
7. Move the brake pipes aside far enough to allow for lifting the ABS 5.3 unit out of the mounting bracket.
8. Tighten the brake pipe nuts on the master cylinder to avoid leaking brake fluid.
9. Cap the brake pipes.

Installation Procedure





Notice: Refer to Fastener Notice Fastener Notice in Cautions and Notices.

1. Insert the ABS 5.3 hydraulic unit into the mounting bracket and install the nuts.

Tighten the nuts to 15 Nm (11 lb ft).

2. Remove the screw plugs and install all of the hydraulic brake pipes.

Tighten the brake pipe nuts to 22 Nm (16 lb ft).

3. Connect the 31-pin wiring harness connector J1.
4. Connect the negative battery cable.
5. Bleed the hydraulic system. Refer to Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Manual)Hydraulic Brake System Bleeding (ABS) Hydraulic Brake System Bleeding (ABS) in Hydraulic Brakes.
6. Install the engine coolant reservoir tank and fill the tank with engine coolant.