Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Brake Rotor Thickness Measurement

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

Warning:

Refer to Brake Dust Warning.

  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 four 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. Compare the lowest thickness measurement recorded to the specifications. Refer to Disc Brake Component Specifications.
  5. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification, the brake rotor may be able to be refinished, depending upon surface and wear conditions which may be present.
  6. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the brake rotor requires replacement.
Brake Rotor Surface and Wear Inspection
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 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 variati ...

Other materials:

Safety Locks
The rear door safety locks prevent passengers from opening the rear doors from inside the vehicle. Manual Safety Locks If equipped, the safety lock is located on the inside edge of the rear doors. To use the safety lock: 1. Insert the key into the safety lock slot and turn it so the slot is ...

Sunroof Window Seal Replacement
Removal Procedure Remove the sunroof window panel. Refer to Sunroof Window Replacement. Remove the seal from the window panel frame by pulling the seal away at one point and continuing around the perimeter of the frame. Clean around the edge of the inside surf ...

Rear Disc Brake Pads Replacement
Removal Procedure Warning: Refer to Brake Dust Warning. Note: Always replace disc brake pads in axle sets. Inspect the fluid level in the brake master cylinder reservoir. If the brake fluid level is midway between the maximum-full point and the minimum allowab ...

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