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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:

Connecting a USB Storage Device or iPod/iPhone
To connect a USB storage device, connect the device to the USB port. To connect an iPod/iPhone, connect one end of the device’s cable to the iPod/iPhone and the other end to the USB port. The iPod/iPhone charges while it is connected to the vehicle if the vehicle is in the ACC/ACCESSORY or O ...

Brakes
If the overheat warning no longer displays, the vehicle can be driven. Continue to drive the vehicle slowly for about 10 minutes. Keep a safe vehicle distance from the vehicle in front. If the warning does not come back on, continue to drive normally and have the cooling system checked for pro ...

Liftgate Replacement
Liftgate Replacement Callout Component Name Preliminary Procedures Disconnect the electrical connectors. Disconnect the liftgate struts. Refer to Liftgate Strut Replacement. Remove the body lock pillar upper trim. Refe ...

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