GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Brake Pads

  • Taper

0.15 mm

0.006 in

Front Brake Rotor JE5

  • Rotor Diameter

316.0 mm

12.44 in

  • Rotor Discard Thickness*

28.5 mm

1.122 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

28.5 mm

1.122 in

  • Rotor Thickness (New)

30.0 mm

1.181 in

Front Brake Rotor J55

  • Rotor Diameter

345.0 mm

13.58 in

  • Rotor Discard Thickness*

28.5 mm

1.122 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

28.5 mm

1.122 in

  • Rotor Thickness (New)

30.0 mm

1.181 in

Front Brake Rotor J56

  • Rotor Diameter

370.0 mm

14.57 in

  • Rotor Discard Thickness*

32.0 mm

1.259 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

31.0 mm

1.220 in

  • Rotor Thickness New

34.0 mm

1.338 in

Rear Brake Rotor JE5

  • Rotor Diameter

315.0 mm

12.40 in

  • Rotor Discard Thickness*

21.5 mm

0.846 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

21.5 mm

0.846 in

  • Rotor Thickness New

23.0 mm

0.906 in

Rear Brake Rotor J55

  • Rotor Diameter

339.0 mm

13.35 in

  • Rotor Discard Thickness*

21.5 mm

0.846 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

21.5 mm

0.846 in

  • Rotor Thickness New

23.0 mm

0.906 in

Rear Brake Rotor J56

  • Rotor Diameter

365.0 mm

14.37 in

  • Rotor Discard Thickness*

26.0 mm

1.023 in

  • Rotor Maximum Allowable Assembled Lateral Runout

0.06 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 Minimum Thickness After Refinishing

27.0 mm

1.062 in

  • Rotor Thickness New

28.0 mm

1.102 in

* All disc 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.