Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
3.12
Brake system: checking condition of
brake hoses, and checking that caps are
fitted on bleeder screws
Requirements:
• Brake hoses must not touch any components when steering
is on full lock.
• Brake hoses must not be twisted.
Procedure:
– Check that all brake hoses are secured properly; when doing
so, ensure that the conditions listed are met:
– Check all brake hoses for abrasion, porosity, blistering and
cracking.
– Check that brake connections are seated correctly, and check
for corrosion and leaks.
– If faults are found on brake hoses: Repair/renew relevant com‐
ponent.
– Check that caps are fitted and secured on bleeder screws of
all brake calipers.
– Renew any missing caps.
3.13
Brake pads: checking thickness
Special tools and workshop equipment required
♦ Test pin - T40139- : Use the side with the thin probe (brake
symbol) to measure brake pad thickness.
Table of test values and procedure guidelines:
Axle
Brake pad wear limit including backplate and damper
plate
[mm]
Front axle:
9
Rear axle:
8
Check only the thickness of the outer brake pads.
Procedure:
– Before you begin: Push sliding ring towards tip of test pin as
far as it will go.
– Bring tip of test pin into contact with brake disc.
Audi A8 2010 ➤
Maintenance - Edition 11.2014
42
3. Maintenance
