GM Service Manual Online
For 1990-2009 cars only

Caution: Two different designs of the front brake rotors and front brake pads are used on this vehicle. Do NOT interchange first design and second design parts, or a loss of braking and personal injury could occur.

Application

Specification

Metric

English

Front Brake Pads

  • Taper

0.15 mm

0.006 in

Front Brake Rotors

  • Rotor Diameter, First Design Before VIN 5U129029

303.0 mm

11.90 in

  • Rotor Diameter, Second Design After VIN 5U129029

303.0 mm

11.90 in

  • Rotor Diameter (J55)

330.0 mm

12.99 in

  • Rotor Discard Thickness*, First Design Before VIN 5U129029

30.70 mm

1.209 in

  • Rotor Discard Thickness*, Second Design After VIN 5U129029

28.50 mm

1.122 in

  • Rotor Discard Thickness (J55)*

36.0 mm

1.417 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, First Design Before VIN 5U129029

31.08 mm

1.224 in

  • Rotor Minimum Allowable Thickness after Refinishing, Second Design After VIN 5U129029

28.66 mm

1.125 in

  • Rotor Minimum Allowable Thickness after Refinishing (J55)

37.0 mm

1.457 in

  • Rotor Thickness (New), First Design Before VIN 5U129029

32.20 mm

1.267 in

  • Rotor Thickness (New), Second Design After VIN 5U129029

30.0 mm

1.181 in

  • Rotor Thickness (New, J55)

38.0 mm

1.496 in

Rear Brake Pads

  • Taper

0.15 mm

0.006 in

Rear Brake Rotors

  • Rotor Diameter

297.0 mm

11.70 in

  • Rotor Diameter (J55)

325.0 mm

12.79 in

  • Rotor Discard Thickness*

9.00 mm

0.354 in

  • Rotor Discard Thickness (J55)*

18.50 mm

0.728 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)

19.0 mm

0.748 in

  • Rotor Thickness (New)

11.0 mm

0.433 in

  • Rotor Thickness (New, J55)

20.0 mm

0.787 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.