Brake Rotor Thickness, Checking

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At a distance of 120° the marks for the measurement for deterring the wear can be found

Measure the brake rotor thickness at these three locations

Here is the third measuring point in the example

Fig 1: Wear Indicator A Through D

Courtesy of AUDI OF AMERICA, LLC

The minimum permissible brake rotor thickness "min.th." is engraved in the brake rotor cup.

-- Measure the brake rotor thickness -x- three times around the circumference at the measuring locations.

Fig 2: Measure Brake Disc Thickness Three Times On Each Wear Indicator Circumference Of Brake Disc

Courtesy of AUDI OF AMERICA, LLC

If the brake rotor thickness "min.th." falls short at one measuring point, the brake rotor must be replaced.

Example of minimum thickness: -3-, brake rotor thickness. It must not fall short of this value.

Fig 3: Identifying Ceramic Brake Rotor Data

Courtesy of AUDI OF AMERICA, LLC

NOTE:

The value -3- can be different depending on the brake rotor.

If there is abrasion both brake rotors on both sides of the axle must always be replaced.

If the brake rotor thickness does "not" fall short continue. Refer to CHECKING WITH Carbon-Ceramic Brake Wear Tester .