Brake Rotor Thickness, Checking Without Stamped Thickness

Special Tools And Workshop Equipment Required

Use a commercially available caliper gauge or a micrometer gauge

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

-- Measure the brake rotor thickness three times on each wear indicator the circumference of the of the brake rotor -x-.

Fig 1: Measure Brake Disc Thickness Three Times On Each Wear Indicator Circumference Of Brake Disc

Courtesy of AUDI OF AMERICA, LLC

NOTE:

When dimension x = min. Th. "+ 0.20 mm" is reached, then determine the wear on the brake rotor again using the wear indicators.

If the minimum permissible brake rotor thickness "min.Th." is reached or falls below, then the brake rotor can no longer be used. The brake rotor must be replaced.

In this case, replace the brake rotors on each side of the axle.

Brake pads likewise must always be replaced on both sides of the axle.