Tools Required

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

J 21177-A Drum-to-Brake Shoe Clearance Gage

Important: The park brake shoes must be adjusted before the park brake pedal is adjusted.

Set the J 21177-A so that it contacts the inside diameter of the rotor.

Fig 1: Measuring Rotor Inside Diameter

Courtesy of GENERAL MOTORS CORP.

Position the J 21177-A over the shoe and the lining at the widest point.
Turn the adjuster nut until the lining just contacts the J 21177-A.
Repeat steps 1-3 for the opposite side.
The clearance between the park brake shoe and the rotor is 0.6604 mm (0.026 in).

Fig 2: Checking Clearance Between Park Brake Shoe & Rotor
Courtesy of GENERAL MOTORS CORP.