GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Brake Drums

Inside Diameter New

225.25 mm

8.868 in

Maximum Allowable Radial Runout

0.104 mm

0.004 in

Maximum Diameter After Refinish

225.78 mm

8.889 in

Discard Diameter *

226.31 mm

8.909 in

Front Brake Rotors

  • Rotor Diameter

278.0 mm

10.944 in

  • Lateral Runout

0.04 mm

0.0015 in

  • Thickness Variation

0.025 mm

0.001 in

  • Rotor Thickness New

26.2 mm

1.031 in

  • Minimum Thickness After Refinish

24.9 mm

0.980 in

  • Discard Thickness *

24.7 mm

0.972 in

Rear Brake Rotors

  • Rotor Diameter

278.0 mm

10.944 in

  • Lateral Runout

0.04 mm

0.0015 in

  • Thickness Variation

0.025 mm

0.001 in

  • Rotor Thickness New

11.0 mm

0.433 in

  • Minimum Thickness After Refinish

9.85 mm

0.388 in

  • Discard Thickness *

9.0 mm

0.354 in

Front Caliper Bore Diameter

60.0 mm

2.36 in

Rear Caliper Bore Diameter

38.0 mm

1.50 in

Master Cylinder Bore Diameter

25.40 mm

1.00 in

Wheel Cylinder Bore Diameter

22.20 mm

0.87 in

* All brake drums and rotors have a discard dimension cast into them. Replace any drum or rotor that does not meet this specification. After refinishing the drum or rotor, replace any drum or rotor that does not meet the maximum diameter or minimum thickness after refinish specification.