Brake Rotor Thickness, Checking For Wear

• New measurement tolerance of 0.05 mm for brake rotors with stamped minimum weight "min weight".
• Refer to BRAKE ROTOR THICKNESS, CHECKING, WITH STAMPED MINIMUM WEIGHT 

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.
• The wear indicators are not present on all brake rotors.
• New measurement tolerance of 0.05 mm for brake rotors with stamped minimum weight "min weight".
• Refer to BRAKE ROTOR THICKNESS, CHECKING, WITH STAMPED MINIMUM WEIGHT