Brake Rotor Thickness, Checking For Wear

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Special tools and workshop equipment required

Commercially available digital caliper or micrometer gauge.

Procedure

Fig 1: Identifying Ceramic Brake Rotor Data

Courtesy of AUDI OF AMERICA, LLC

The minimum permitted brake rotor thickness "min.th." is engraved in the brake rotor cup -3-.

-- Measure the brake rotor thickness -x- three times around the circumference in addition to the individual wear indicators.

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

Courtesy of AUDI OF AMERICA, LLC

If dimension -x- = minimum thickness +0.2 mm is reached, also check the wear indicators to determine the brake rotor wear. Refer to WEAR INDICATORS, CHECKING .

CAUTION:

Risk of accident due to insufficient braking action on worn ceramic brake rotors.

Reusing ceramic brake rotors that have reached the wear limit is not permitted.

- Immediately replace the ceramic brake rotors once they have reached one of the wear limits defined below.

CAUTION:

Risk of accident due to uneven braking.

- If a brake rotor is damaged or worn, check the other brake rotors for damage and wear.