GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Savana 🢒 Brakes 🢒 Disc Brakes 🢒 Component Specifications
Table 1: Brake Systems
Table 2: Front Brake Rotor Thickness

Brake Systems

Series

System

Front Brakes

Rear Brakes

Brake Assist

1500 (600/7100 GVW) 2500 (7300 GVW)

JB6

Disc 11.57 x 1.25

Drum 11.15 x 2.75

Vacuum

2500 (8600 GVW)

JD7

Disc 12.50 x 1.26

Drum 13.00 x 2.50 (Diesel 13.00 x 3.50)

Hydraulic

3500 Single Wheel

JB8

Disc 12.50 x 1.26

Drum 13.00 x 3.50

Hydraulic

3500 Dual Wheel

JB8

Disc 12.50 x 1.50

Drum 13.00 x 3.50

Hydraulic

Front Brake Rotor Thickness

Series

Original

Maximum Refinish

Discard Thickness

1500

31.75 mm (1.25 in)

31.25 mm (1.23 in)

30.86 mm (1.215 in)

1500 and 2500

32 mm (1.26 in)

31.25 mm (1.23 in)

30.86 mm (1.215 in)

3500

38.10 mm (1.5 in)

37.59 mm (1.480 in)

37.21 mm (1.465 in)