Brake Rotor Thickness Measurement

Special Tools 

CH-230-A  Disc Gauge

Equivalent regional tools: Special Tools 

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 (J60) , or Front Disc Brake Pads Replacement (JQ5) , or Front Disc Brake Pads Replacement (J17) , and/or Rear Disc Brake Pads Replacement (GNC) , or Rear Disc Brake Pads Replacement (GNQ) , if equipped.
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.

3. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   Ensure the measurements are only taken within the friction surfaces.

   Install the CH-230-A  Disc Gauge for brake rotor thickness measurement.

   1. Measure and record the thickness of the brake rotor at 4 or more points from the brake rotor inside to outside.
   2. Compare the lowest thickness measurement to the disc brake component specifications. Refer to Disc Brake Component Specifications .
4. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement. Refer to Front Brake Rotor Replacement (JQ5) , or Front Brake Rotor Replacement (J17, J60) , and/or Rear Brake Rotor Replacement .