DETERMINING WEAR USING Carbon-Ceramic Brake Wear Tester:VAS6813

• 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 wear value -C- for the Carbon-Ceramic Brake Wear Tester:VAS6813  is engraved on the brake rotor cup.
  Fig 1: Wear Indicator A Through D

  Courtesy of AUDI
• The values -A and C- can be different depending on the location.
• The values -A and C- can be different depending on the brake rotor.
• Value -A- is a value from the production of the new brake rotor

• The wheel is installed.
• The brake rotor thickness is checked.
• The measuring device is checked. Refer to Carbon-Ceramic Brake Wear Tester .

Special tools and workshop equipment required 

• Carbon-Ceramic Brake Wear Tester:VAS6813 

Carbon-Ceramic Brake Wear Tester:VAS6813  :

• 1 On/Off button
• 2 Measured value hold button
• 3 Measured value display
• 4 Laser beam positioning tab
• 5 Interface
  Fig 2: Carbon-Ceramic Brake Wear Tester (VAS6813)

  Courtesy of AUDI

Additional information on the Carbon-Ceramic Brake Wear Tester:VAS6813  can be found in the accompanying Service Information.

Measurement:

• The brake rotor must be clean.
• The brake rotor must be dry.

At a distance of 120° the marks for the measurement for deterring the wear can be found

The following described measurement must take place on all three measurement locations to guarantee a correct check.

-A- new value, -C- wear value, -B- number of the measurement location, -D- mark for the laser beam for the measurement of the wear value.

Fig 3: Wear Indicator A Through D

Courtesy of AUDI

For example the third measurement location -B- from "1 to 3" can be seen.

TIP:

The values -A and C- are different depending on the location.

The values -A and C- are different depending on the brake rotor.

-- Position the Carbon-Ceramic Brake Wear Tester:VAS6813  flush with the outer edge of the brake rotor.

-- Switch on the Carbon-Ceramic Brake Wear Tester:VAS6813  .

-- Move the Carbon-Ceramic Brake Wear Tester:VAS6813  -1- along the outer edge -2- until the laser beam points exactly on the mark -D- on the brake rotor.

Courtesy of AUDI

-- Determine the wear on all three measurement locations of the brake rotor from "1 to 3".

-- Read the displayed value on the Carbon-Ceramic Brake Wear Tester:VAS6813  .

If one of the three wear values -C- is reached or falls short, the brake rotor must be removed for further wear determination.

Fig 4: Wear Indicator A Through D

Courtesy of AUDI

TIP:

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

-- Remove the brake rotor.

• To avoid a false measurement, place the brake rotor on a surface that will not conduct electricity (for example, a wooden table).
• The surface must be clean and dry
• The brake rotor must be clean and dry

-- Position the Carbon-Ceramic Brake Wear Tester:VAS6813  flush with the outer edge of the brake rotor again.

The measurement must take place again on all three measurement locations to guarantee a correct check.

-- Move the Carbon-Ceramic Brake Wear Tester:VAS6813  -1- along the outer edge -2- again until the laser beam points exactly on the mark -D- on the brake rotor.

Courtesy of AUDI

-- Determine the wear on all three measurement locations of the brake rotor from "1 to 3".

-- Read the displayed value on the Carbon-Ceramic Brake Wear Tester:VAS6813  .

If one of the three wear values -C- is reached or falls below, the brake rotor must be replaced.

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