GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Rear of the Engine Compartment


Object Number: 1203232  Size: LF
(1)Brake Fluid Level Switch
(2)Brake Fluid Pressure Sensor (JL4)
(3)Brake Pressure Modulator Valve (BPMV)
(4)Electronic Brake Control Module (EBCM)
Figure 2:

Left Front of the Passenger Compartment


Object Number: 1203234  Size: LF
(1)Park Brake Switch