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

Near the Brake Booster


Object Number: 1826053  Size: LF
(1)Brake Fluid Level Switch
(2)LF Strut Tower
(3)Electronic Brake Control Module (EBCM)
Figure 2:

Park Brake Assembly


Object Number: 1825907  Size: LF
(1)Park Brake Switch
(2)Park Brake Handle
(3)Floor Panel