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

Left Rear of Engine Compartment


Object Number: 1676527  Size: LF
(1)Brake Booster Vacuum Sensor (LS4)
(2)Brake Booster
(3)Brake Fluid Level Switch
Figure 2:

Pedal Assemblies


Object Number: 1700245  Size: LF
(1)Park Brake Switch
(2)Dash Panel
(3)Brake Pedal Position Sensor
(4)Accelerator Pedal Position (APP) Sensor