GM Service Manual Online
For 1990-2009 cars only

Component Specifications Front

Application

Specification

Metric

English

Front Disc Brake Inner And Outer Pads

Disc Pad Material

--

Semi-metallic, Non-asbestos

Wear Sensor

--

Electronic

Approximate Thickness of New Brake Lining with Lining Plate

17.5 +/- 0.6 mm

0.688" +/- 0.023"

Minimum Remaining Thickness Including Lining Plate

8 mm

0.315"

Minimum Taper

0.15 mm

0.006"

Front Brake Caliper

Type

--

Single Cylinder, Sliding Caliper

Caliper Bore Diameter

57.0 mm

2.244"

Front Brake Rotor

Type

--

Vented

Diameter (Nominal)

296 mm

11.653"

Maximum Lateral Runout (Installed)

0.16 mm

0.004"

Maximum Lateral Runout (Removed)

0.04 mm

0.001"

Thickness (New)

28 mm

1.102"

Maximum Thickness Variation

0.02 mm

0.0005"

Minimum Thickness after Refinish

26.5 mm

1.043"

Discard Thickness

* All front brake rotors have a discard dimension cast in them. This is a wear dimension and not a refinish dimension. Any front brake rotor which does not meet the specification should be replaced.

25 mm

0.984"

Rotor Refinishing Specifications

Ammco® Brake Lathe

Rough Cut

Spindle Speed

--

150 rpm

Depth of Cut (per side)

0.15 to 0.64 mm

0.006" to 0.025"

Tool Crossfeed (per revolution)

0.25 mm

0.010"

Minimum Remaining Thickness Including Lining Plate

8 mm

0.315"

Vibration Dampener

--

Yes

Sand Front Brake Rotor (Swirl Pattern)

--

No

Finish Cut

Spindle Speed

--

150 rpm

Depth of Cut

0.10 to 0.15 mm

0.004" to 0.006"

Tool Crossfeed (per revolution)

0.05 mm

0.002"

Vibration Dampener

--

Yes

Sand Front Brake Rotor (Swirl Pattern)

--

Yes

Accuturn® Brake Lathe

Single Cut

Spindle Speed

--

105 rpm

Depth of Cut

--

As necessary

Tool Crossfeed (per revolution)

0.08 mm

0.003"

Vibration Dampener

--

Yes

Sand Front Brake Rotor (Swirl Pattern)

--

Yes

Component Specifications Rear

Application

Specification

Metric

English

Rear Brake Caliper Piston Bore Diameter

40 mm

1.574"

Rear Brake Rotor Diameter (Nominal)

286 mm

11.259"

Rear Brake Rotor Lateral Runout (On-Vehicle)

0.10 mm

0.004"

Maximum Thickness Variation

0.0013 mm

0.0005"

Rear Brake Rotor Thickness (New)

12 mm

0.472"

Minimum Thickness After Refinish

11 mm

0.433"

Discard Thickness

10 mm

0.393"

Maximum Taper

All rear brake rotors have a discard dimension cast into them. This is a wear dimension and not a refinish dimension.

Any rear brake rotor which does not meet this specification should be replaced.

0.15 mm

0.006"

Rotor Refinishing Specifications

Ammco Brake Lathe

Rough Cut

Spindle Speed

--

150 rpm

Depth of Cut (Per Side)

0.15 to 0.64 mm

0.006" to 0.025"

Tool Crossfeed (Per Rev.)

0.25 mm

0.010"

Vibration Dampener

--

Yes

Sand Brake Rotor (Swirl Pattern)

--

No

Finish Cut

Spindle Speed

--

150 rpm

Depth of Cut (Per Side)

0.10 to 0.15 mm

0.004" to 0.006"

Tool Crossfeed (Per Rev.)

0.05 mm

0.002"

Vibration Dampener

--

Yes

Sand Brake Rotor (Swirl Pattern)

--

Yes

Accuturn Brake Lathe

Single Cut Refinishing

Spindle Speed

--

105 rpm

Depth of Cut

--

As necessary

Tool Crossfeed (Per Rev.)

0.08 mm

0.003"

Vibration Dampener

Yes

Yes