GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Front Brake Pads

  • Taper

0.15 mm

0.006 in

Front Brake Rotors

  • Rotor Diameter

303.0 mm

11.9 in

  • Rotor Diameter (J55)

325.0 mm

12.8 in

  • Rotor Discard Thickness*

30.7 mm

1.209 in

  • Rotor Discard Thickness (J55)*

36.5 mm

1.437 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 mm

0.002 in

  • Rotor Maximum Allowable Assembled Lateral Runout (J55)

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Maximum Allowable Thickness Variation (J55)

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness after Refinishing

31.08 mm

1.224 in

  • Rotor Minimum Allowable Thickness after Refinishing (J55)

37.0 mm

1.457 in

  • Rotor Thickness (New)

32.20 mm

1.267 in

  • Rotor Thickness (New, J55)

38.00 mm

1.496 in

Rear Brake Pads

  • Taper

0.15 mm

0.006 in

Rear Brake Rotors

  • Rotor Diameter

297.00 mm

11.7 in

  • Rotor Diameter (J55)

29.00 mm

1.142 in

  • Rotor Discard Thickness*

9.00 mm

0.354 in

  • Rotor Discard Thickness (J55)*

27.5 mm

1.083 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 mm

0.002 in

  • Rotor Maximum Allowable Assembled Lateral Runout (J55)

0.05 mm

0.002 in

  • Rotor Maximum Allowable Scoring

1.50 mm

0.059 in

  • Rotor Maximum Allowable Thickness Variation

0.025 mm

0.001 in

  • Rotor Maximum Allowable Thickness Variation (J55)

0.025 mm

0.001 in

  • Rotor Minimum Allowable Thickness after Refinishing

10.25 mm

0.404 in

  • Rotor Minimum Allowable Thickness after Refinishing (J55)

28.0 mm

1.102 in

  • Rotor Thickness (New)

11.00 mm

0.433 in

  • Rotor Thickness (New, J55)

29.00 mm

01.142 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.