Audi A6 2005 Workshop Manual page 25

3.5.2 Checking tester - VAS 6813-
Before taking measurements, the tester - VAS 6813- must be
checked using the measuring plate provided.
Measuring plate:
– Place tester in both openings -arrows- of measuring plate so
that laser beam points downwards towards marking with af‐
fixed reference value.
– Switch on tester.
The value now shown must correspond to the reference value
affixed to the measuring plate.
Note
If the value shown differs from the reference value by more
♦
than ± 2.0 units, the tester must be re-calibrated by the sup‐
plier.
Please refer to the enclosed instructions for further informa‐
♦
tion.
3.5.3 Wear assessment with tester - VAS
6813-
Note
The degree of wear is determined by measuring the brake disc
♦
thickness AND the wear value using the tester - VAS 6813- ;
both values must be measured three times each.
The wear value -C- for the tester - VAS 6813- is engraved on
♦
the brake disc hub.
Values -A and C- may vary depending on the measuring point.
♦
Values -A and C- may vary depending on the brake disc.
♦
Value -A- is a value from the production of the new brake disc.
♦
• Wheel has been removed.
• Brake disc thickness has been checked.
• Tester has been checked
⇒ "3.5.2 Checking tester VAS 6813 ", page 19
Special tools and workshop equipment required
♦ Tester - VAS 6813-
Audi A6 2005 ➤ , Audi A6 Avant 2005 ➤
Brake system - Edition 04.2019
.
3. Assessing degree of wear on ceramic brake discs
19