GM Service Manual Online
For 1990-2009 cars only

System

Front Brakes

Rear Brakes

Brake Assist

Type

Metric

English

Type

Metric

English

JB5

Disc

295.0 x 31.8 mm

11.57 x 1.25 in

Leading/ Trailing

254 x 57 mm

9.96 x 2.24 in

Vacuum

JD5

Disc

295.0 x 31.8 mm

11.57 x 1.25 in

Leading/ Trailing

254 x 57 mm

9.96 x 2.24 in

Hydraulic

JB6

Disc

295.0 x 31.8 mm

11.57 x 1.25 in

Duo-Servo

284 x 70.1 mm

11.15 x 2.75 in

Vacuum

JD6

Disc

295.0 x 31.8 mm

11.57 x 1.25 in

Duo-Servo

284 x 70.1 mm

11.15 x 2.75 in

Hydraulic

JB7

Disc

319 x 32.1 mm

12.5 x 1.26 in

Duo-Servo

331.5 x 64 mm

13.00 x 2.5 in

Vacuum

JD7

Disc

319 x 32.1 mm

12.5 x 1.26 in

Duo-Servo

331.5 x 64 mm

13.00 x 2.5 in

Hydraulic

JB8 Single Rear Wheel

Disc

319 x 32.1 mm

12.5 x 1.26 in

Duo-Servo

331.5 x 64 mm

13.00 x 2.5 in

Hydraulic

JB8 Dual Wheel

Disc

319 x 32.1 mm

12.5 x 1.26 in

Duo-Servo

331.5 x 64 mm

13.00 x 2.5 in

Hydraulic

JF9

Disc

353.4 x 36.6 mm

13.86 x 1.44 in

Disc

346.3 x 36.6 mm

13.58 x 1.44 in

Hydraulic

Z56

Disc

319 x 32.1 mm

12.5 x 1.26 in

Duo-Servo

284 x 70.1 mm

11.15 x 2.75 in

Vacuum