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 J41/J67

  • Rotor Diameter

276.0 mm

10.866 in

  • Rotor Discard Thickness*

22.8 mm

0.898 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Minimum Allowable Thickness After Refinish

23.0 mm

0.906 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Thickness New

26.0 mm

1.023 in

Front Brakes JL9

  • Rotor Diameter

296.0 mm

11.653 in

  • Rotor Discard Thickness*

22.8 mm

0.898 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Minimum Allowable Thickness After Refinish

23.0 mm

0.906 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Thickness New

26.0 mm

1.023 in

Rear Brakes JL9/J67

  • Rotor Diameter

270.0 mm

10.630 in

  • Rotor Discard Thickness*

11.8 mm

0.465 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Minimum Allowable Thickness After Refinish

12.0 mm

0.472 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Thickness New

14.0 mm

0.551 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 specification.