Electronic Brake Control Module: Service and Repair

Brake Modulator Assembly Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution Battery Disconnect Caution.

1. Disconnect the negative battery cable.
2. Disconnect the 31-pin antilock brake system (ABS) wiring harness connector from its socket on the electronic brake control module (EBCM).
3. 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 brake pressure modulator valve or into the brake pipes from the master cylinder. If air gets into the brake pressure modulator valve, it will require a bleeding procedure using a scan tool programmed for the ABS 5.3 system. As long as no air enters the brake pressure modulator valve, a simple bleeding procedure is all the system will require.

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

Installation Procedure

Notice: Refer to Fastener Notice Fastener Notice.

1. Insert the ABS brake pressure modulator valve 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 (ABS) Hydraulic Brake System Bleeding (ABS)Hydraulic Brake System Bleeding (Manual) Hydraulic Brake System Bleeding (Manual).
6. Refer to Control Module References Control Module References for programming and setup information.