GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Caliper Bore Diameter - Front

60.0 mm

2.36 in

Caliper Bore Diameter - Rear

38.0 mm

1.50 in

Front Brakes

  • Rotor Discard Thickness *

24.7 mm

0.972 in

  • Rotor Diameter

278.0 mm

10.944 in

  • Rotor Maximum Allowable Lateral Runout

0.04 mm

0.0015 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness After Refinish

24.9 mm

0.980 in

  • Rotor Thickness New

26.2 mm

1.031 in

Rear Brakes:

  • Rotor Discard Thickness *

9.0 mm

0.354 in

  • Rotor Maximum Allowable Lateral Runout

0.04 mm

0.0015 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness After Refinish

9.85 mm

0.388 in

  • Rotor Thickness New

11.0 mm

0.433 in

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