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

Brake Fluid Level Switch (Except JC4)


Object Number: 309912  Size: MF
(1)Hydraulic Brake Line
(2)Bracket for Chassis Harness Studs
(3)LH Front Lower Dash Panel
(4)Bracket for Chassis Harness
(5)Inline Connector
(6)Inline Connector
(7)Fuse Block - Underhood Connector
(8)Fuse Block - Underhood Eyelet Connector
(9)Brake Fluid Level Switch Connector
(10)Brake Fluid Level Switch
(11)Brake Fluid Reservoir
Figure 2:

Brake Pressure Differential Switch (JC4)


Object Number: 1541315  Size: MF
(1)Supplemental Brake Assist Pump Motor
(2)Chassis Harness
(3)Brake Pressure Differential Switch
Figure 3:

Park Brake Switch


Object Number: 1359047  Size: LF
(1)Park Brake Switch Connector
(2)Body Harness
(3)Park Brake Switch
(4)Park Brake Lever
(5)Cowel Side Inner Panel
Figure 4:

Supplemental Brake Assist Pump Motor (JC4)


Object Number: 886381  Size: MF
(1)Supplemental Brake Assist Pump Motor Connector
(2)Brake Booster Assembly
(3)Supplemental Brake Assist Pump Motor