GM Service Manual Online
For 1990-2009 cars only

Disc Brake Component Specifications JE5, JL9

Application

Specification

Metric

English

Front Brake Pads

  • Taper

0.15 mm

0.006 in

Front Brake Rotors

  • Rotor Diameter

303.00 mm

11.929 in

  • Rotor Minimum Thickness

30.70 mm

1.209 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 Thickness New

32.20 mm

1.267 in

Rear Brake Pads

  • Taper

0.15 mm

0.006 in

Rear Brake Rotors

  • Rotor Diameter

298.00 mm

11.732 in

  • Rotor Minimum Thickness

24.00 mm

0.944 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 Thickness New

26.00 mm

1.023 in

Disc Brake Component Specifications J56

Application

Specification

Metric

English

Front Brake Pads

  • Taper

0.15 mm

0.006 in

Front Brake Rotor

  • Rotor Diameter

355.00 mm

13.976 in

  • Rotor Discard Thickness*

30.00 mm

1.181 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

32.00 mm

1.259 in

Rear Brake Pads

  • Taper

0.15 mm

0.006 in

Rear Brake Rotor

  • Rotor Diameter

365.00 mm

14.370 in

  • Rotor Discard Thickness*

26.00 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

27.00 mm

1.062 in

  • Rotor Thickness New

28.00 mm

1.102 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.