Chevrolet Sonic manuals

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.

  1. 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.
  2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.

  3. 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.

  4. Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation.
  5. 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.

  6. 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)

  7. 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:

Door Locks
To lock or unlock the doors from outside the vehicle: Use the key in the driver door to lock all doors or unlock the driver door only. Press or on the Remote Keyless Entry (RKE) transmitter. See Remote Keyless Entry (RKE) System Operation. To lock the doors from inside the vehic ...

Backup Lamp Switch Replacement
Backup Lamp Switch Replacement Callout Component Name Preliminary Procedure Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection. Without draining the coolant or removing the ...

Front Wheel Drive Shaft Seal Replacement - Left Side
Front Wheel Drive Shaft Seal Replacement - Left Side Callout Component Name Preliminary Procedure Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle. Remove the front wheel drive shaft from the transm ...

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