GM Service Manual Online
For 1990-2009 cars only

Application

RPO

mm

In

Front Disc Brakes

JM3

266.7 x 26.16

10.5 x 1.03

Rear Drum Brakes

JM3

240.30 x 50.80

9.5 x 2

Brake Assist Tandem Diaphragm

JM3

240

9.45

Front Disc Brakes

JC1

274.32 x 28.96

10.8 x 1.14

Rear Disc Brakes

JC1

294.64 x 20.07

11.6 x .79

Brake Assist Tandem Diaphragm

JC1

260

10.24

Brake Master Cylinder

JM3

24 x 36

0.94 x 1.42

Brake Master Cylinder

JC1

25.4

1