GM Service Manual Online
For 1990-2009 cars only

Component Specifications Drum Diameter

Application

Specification

Metric

English

All

  • Original

241.3 mm

9.50"

  • Thinnest (Refinishing)

242.82 mm

9.56"

  • Replacement (Discard)

243.59 mm

9.59"

Component Specifications Brake Systems

Brake Systems Specifications

Application

RPO Code

Front Disc Brakes (diameter x thickness)

Rear Drum Brakes (diameter x width)

Brake Assist System

M-Van (RWD)

JM4

11.86" x 1.04"

9.5" x 2"

Hydraulic

L-Van (F4WD)

JM4

11.57" x 1.25"

9.5" x 2"

Hydraulic