GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Rear Brake Drums

  • Runout

0.05 mm

0.002 in

  • Inside Diameter

230.0 mm

9.05 in

  • Maximum Refinish Diameter

230.65 mm

9.08 in

  • Discard Diameter *

231.0 mm

9.09 in

Brake Rotors

  • Lateral Runout
  • Front

0.03 mm

0.001 in

  • Rear

0.03 mm

0.001 in

  • Thickness Variation
  • Front

0.008 mm

0.0003 in

  • Rear

0.01 mm

0.0004 in

Front Brake Rotors

  • Diameter

287.9 mm

11.3 in

  • New Thickness (Nominal)

25.0 mm

0.98 in

  • Minimum Thickness After Refinish

23.1 mm

0.90 in

  • Discard Thickness *

22.8 mm

0.87 in

  • Rear Brake Rotors
  • Diameter

286.0 mm

11.25 in

  • New Thickness (Nominal)

10.0 mm

0.39 in

  • Minimum Thickness After Refinish

9.0 mm

0.35 in

  • Discard Thickness *

Important: If park brake drum on rear rotor is badly worn, replace rotor.

8.0 mm

031 in

Brake Linings

  • Front Disc Pads
  • New Thickness

14.0 mm

0.55 in

  • Discard Thickness

2.0 mm

0.08 in

  • Rear Disc Pads
  • New Thickness

10.8 mm

0.42 in

  • Discard Thickness

2.0 mm

0.08 in

  • Parking Brake Shoes (4 Wheel Disc Brakes)
  • New Thickness

3.0 mm

0.12 in

  • Discard Thickness

2.0 mm

0.08 in

  • Rear Drum Shoes
  • New Diameter

5.1 mm

0.20 in

  • Discard Thickness

2.0 mm

0.08 in

Hub and Bearing Assemblies

  • Front
  
  • Radial Runout

0.075 mm

0.003 in

  • Lateral Runout

0.065 mm

0.003 in

  • Rear
  • Lateral Runout

0.040 mm

0.001 in

  • Radial Runout

0.050 mm

0.002 in

Caliper Bore Diameter

  • Front

57.0 mm

2.24 in

  • Rear

35.0 mm

1.38 in

* Brake drums and rotors have a discard diameter or thickness dimension cast into them. This is a wear dimension and not a refinish dimension. Any drum or rotor which does not meet the specification values should be discarded.