GM Service Manual Online
For 1990-2009 cars only

Component Specifications Rear Wheel

General Specifications, Rear Wheel

System

Caliper Housing Bore

Rotor

RPO Code

Diameter

Diameter (nominal)

Rotor (On-Vehicle) Lateral Runout

Axle Shaft Flange Lateral Runout

JC1

48 mm (1.88 in)

295 mm (11.614 in)

0.10 mm (0.004 in)

0.05 mm (0.002 in)

Component Specifications Rotor Thickness, Front Wheel

Brake Rotor Thickness, Front Wheel

System

Original

Thickness Variation

Minimum Thickness After Refinishing

Discard

JM3

26.2 mm (1.03 in)

0.010 mm (0.0003 in)

24.89 mm (0.980 in)

24.51 mm (0.965 in)

JC1

29 mm (1.14 in)

0.010 mm (0.0003 in)

28.8 mm (1.13 in)

27.5 mm (1.08 in)

Component Specifications Rotor Thickness, Rear Wheel

Brake Rotor Thickness, Rear Wheel

System

Original

Thickness Variation

Minimum Thickness After Refinishing

Discard

JC1

20.00 mm (0.787 in)

0.013 mm (0.0005 in)

19.64 mm (0.735 in)

18.50 mm (0.728 in)