Chevrolet Sonic Repair Manual: Brake Rotor Thickness Variation Measurement

Chevrolet Sonic Repair Manual / Chassis / Brakes / Disc Brakes / Brake Rotors / Brake Rotor Thickness Variation Measurement

Warning:

Refer to Brake Dust Warning.

Note:

Any disc brake rotor that exhibits thickness variation exceeding the maximum acceptable level must be refinished or replaced. Thickness variation exceeding the maximum acceptable level can cause brake pulsation.

If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement.
Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.

Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the thickness of the brake rotor at 4 or more points, evenly spaced around the brake rotor.
Make sure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the brake rotor, about 13 mm (1/2 in), for each measurement.
Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation.

Note:

Whenever a brake rotor is refinished or replaced, the assembled lateral runout (LRO) of the brake rotor must be measured to make sure optimum performance of the disc brakes.

Compare the thickness variation measurement to the following specification: Specification
- J93, J94: 0.02 mm (0.0008 in)
- JPW, J97: 0.02 mm (0.0008 in)
If the brake rotor thickness variation measurement exceeds the specification, the brake rotor requires refinishing or replacement.

Brake Rotor Thickness Measurement

Warning: Refer to Brake Dust Warning. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Bra ...

Brake Rotor/Drum Balance Inspection

Support the vehicle drive axle on a suitable hoist. Refer to Lifting and Jacking the Vehicle. Remove the tire and wheel assemblies from the drive axle. Refer to Tire and Wheel Removal and ...

Other materials:

Heater Core Inlet Tube Replacement
Heater Core Inlet Tube Replacement Callout Component Name Preliminary Procedures Remove the Heater and Air Conditioning Evaporator and Blower Module. Refer to Heater and Air Conditioning Evaporator and Blower Module Removal ...

Odor Correction
Eliminating Air Conditioning Odor Odors may be emitted from the air conditioning system primarily at start up in hot, humid climates. The following conditions may cause the odor: Debris is present in the HVAC module. Microbial growth on the evaporator core When the blower ...

Air Cleaner Element Replacement
Removal Procedure Disconnect mass air flow sensor wiring harness plug (2) from mass air flow sensor (3). Unclip mass air flow sensor wiring harness retainer clip from air cleaner housing (1). Remove the air cleaner outlet duct clamp̴ ...

0.0078