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Park Brake Shoe Adjustment

  1. Set the Drum-To-Brake Shoe Clearance Gage (J-21177-A) so that it contacts the inside diameter of the rotor. See Fig 1.
  2. Position the drum-to-brake shoe clearance gage over the shoe and the lining at the widest point. See Fig 2.
  3. Turn the adjuster nut until the lining just contacts the drum-to-brake shoe clearance gage.
  4. Repeat steps  1- 3 for the opposite side.
  5. The clearance between the park brake shoe and the rotor is 0.026" (0.6604 mm).
Fig 1: Setting Gauge On Inside Diameter Of Rotor
G00310129Courtesy of GENERAL MOTORS CORP.
Fig 2: Positioning Gauge On Shoe & Lining
G00310130Courtesy of GENERAL MOTORS CORP.
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