Brake Rotor Thickness Measurement

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools

CH-230-A Disc Gauge

Equivalent regional tools:Special Tools

WARNING:

Refer to Brake Dust Warning .

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

NOTE:

Ensure the measurements are only taken within the friction surfaces.

Install the CH-230-A gauge for lateral runout 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 .
If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification, the rotor may be able to be refinished, depending upon surface and wear conditions which may be present.
If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification, the rotor may not be refinished.
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 , and/or Rear Brake Rotor Replacement .