Testing Values and Process Specifications Table:

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Axle	Brake Pad Wear Limit with Backing Plate and Damping Plate [mm]
Front Axle:	10
Rear Axle:	10

Only measure the thickness of the outer brake pad.

Procedure:

-- First slide the sliding ring of the test pin all the way in the direction of the test probe.

-- Move the test probe of the test pin up against the brake rotor.

-- Slide the test pin in the direction of the brake pad until the test pin contacts the brake pad backing plate.

-- Remove the test pin and read the brake pad wear specification -a- on the tool scale.

Fig 1: Checking Front Pad Thickness

Courtesy of AUDI OF AMERICA, LLC

-- Repeat the procedure on all tires.

-- If the pad thickness has reached the wear limit (Refer to Testing Values and Process Specifications Table: for Testing Values and Process Specifications Table), replace the brake pads. Refer to Brake Pads, Removing and Installing .

NOTE:

Make sure the sliding ring does not move when removing, otherwise the measurement result will be incorrect.

Pay attention to where the test pin comes into contact with the brake pad backing and include the thickness of the damping plate accordingly if necessary!

For certain tire combinations, it is necessary to remove the wheels.

For S or RS models, it may be necessary to measure the brake pads from the inside of the wheels.