GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

Brake Drums

  • Discard Diameter

201.4 mm

7.929 in

  • Inside Diameter - New

200.25 mm

7.884 in

  • Maximum Refinish Diameter

201.019 mm

7.914 in

  • Runout

0.15 mm

0.006 in

Brake Pedal Travel *

63.5 mm

2.5 in

Brake Rotors

  • Discard Thickness

18.70 mm

0.736 in

  • Lateral Runout

0.08 mm

0.003 in

  • Minimum Thickness after Refinish

18.776 mm

0.739 in

  • Rotor Diameter

259.0 mm

10.197 in

  • Rotor Thickness - New

19.96 mm

0.786 in

  • Thickness Variation

0.025 mm

0.001 in

Caliper Bore Diameter

57 mm

2.244 in

Master Cylinder Bore Diameter

22.20 mm

0.874 in

Wheel Cylinder Bore Diameter

17.5 mm

0.689 in

*Note: Brake pedal travel maximum with 445 N (100 lb) force applied to pedal with ignition OFF and vacuum assist deleted.

All brake drums and rotors have a discard dimension cast into them. This is a wear dimension and not a refinish dimension. Any drum or rotor which does not meet the specification should be replaced.