Brake Rotor Wear, General Information

• The wear is determined by determining the brake rotor thickness "and" the wear value with the Carbon-Ceramic Brake Wear Tester: VAS6813  ; both must be measured three times respectively around the circumference.
• The permitted brake rotor minimum thickness "min.th." and the wear value -C- are engraved on the brake rotor cup for the Carbon-Ceramic Brake Wear Tester: VAS6813  .
  Fig 1: Wear Indicator A Through D

  Courtesy of AUDI OF AMERICA, LLC

The wear value -C- is different depending on the brake rotor and the measurement location.

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

or

• If one of the three wear values -C- is reached or falls short when determining the wear using the Carbon-Ceramic Brake Wear Tester: VAS6813  , the brake rotor must be replaced.
  Fig 2: Wear Indicator A Through D

  Courtesy of AUDI OF AMERICA, LLC

The wear value -C- is different depending on the brake rotor and the measurement location.

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