Audi A8 2003 Workshop Manual page 15

Caution
Always install
discs of the same type on
both sides of one axle.
The brake disc must first be cleaned before assessing the degree
of wear as described below.
WARNING
Do NOT clean the brake disc with water or other fluids as this
will falsify the results.
Note
The brake disc ventilation drillings must be completely free of
♦
brake dust and dirt. Clear out carefully with a suitable tool if
necessary. Do not use force.
Thoroughly blow out the brake discs with compressed air (in‐
♦
cluding the area between the cooling channels and ventilation
drillings).
Caution
Always observe respiratory protection requirements when
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
cleaning brake discs or other parts of the brake system using
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
compressed air.
with respect to the correctness of information in this document. Copyright by AUDI AG.
To assess the brake disc wear, proceed as follows:
♦ 1. Wear assessment by checking thickness of brake disc
♦ 2. Wear assessment according to wear indicators
1. Wear assessment by checking thickness of brake disc
Thickness of brake discs in permissible range → brake disc OK
Brake disc thickness in critical
range min. Th + 0.2 mm
↓↓
Further wear assessment ac‐
cording to wear indicators
↓↓
2. Wear assessment according to wear indicators
None of the six wear indicators fully worn out → brake disc OK
----------
---------
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brake
⇒ page 11
Value at or below limit
↓↓
Renew brake disc
----------
⇒ page 11
One of the six wear indicators
fully worn out
↓↓
Renew brake disc
Audi A8 2003 ➤
Brake system - Edition 03.2013
3. Assessing degree of wear on ceramic brake discs
9