Removal Procedure

Disconnect the negative battery cable.
NOTE: Avoid spilling brake fluid on any of the vehicle's painted surfaces, wiring, cables or electrical connectors. Brake fluid will damage paint and electrical connections. If any fluid is spilled on the vehicle, immediately flush the area with water to minimize the potential for damage.

NOTE: To prevent equipment damage, never connect or disconnect the wiring harness connection from the EBCM with the ignition switch in the ON position.
Remove the cooling surge tank. Refer to Surge Tank Replacement in Engine Cooling.
Disconnect the ABS wiring harness connector from its socket on the electronic brake control module (EBCM).

Fig 1: Disconnecting ABS Wiring Harness Connector (Mando)
Courtesy of GENERAL MOTORS CORP.
Cover the connector and the socket with shop cloths to protect them from brake fluid.

Fig 2: Removal of Brake Modulator Assembly (Mando)

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Do not 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 brake modulator system. As long as no air enters the hydraulic unit, a simple bleeding procedure is all the system will require.

Remove the brake pipes fitting nuts from the hydraulic unit.
Remove the mounting bracket bolts on the hydraulic unit.
Remove the brake modulator assembly.