Anti-Lock Brake System; General Information On The Anti-Lock Brake System; Notes For Repair Work On The Abs - Audi A8 2003 Workshop Manual

Audi A8 2003 ➤
Brake system - Edition 03.2013
45 –

Anti-lock brake system

1 General information on the anti-lock
brake system
1.1

Notes for repair work on the ABS

WARNING
The anti-lock brake system is basically maintenance-free.
Testing, removing, installing and repair work may only be per‐
formed by qualified personnel.
Failure to observe the information described in this Workshop
Manual may result in damage to the system and could make
the vehicle unsafe.
♦ Before carrying out repair work on the anti-lock brake system,
determine the cause of the problem using self-diagnosis.
♦ When installing a new hydraulic control unit, always check the
coding ⇒ VAS 505x vehicle diagnostic, testing and information
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system .
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♦ Always switch off the ignition before carrying out installation
or repair work. On vehicles with a coded radio, find out the anti-
theft code and disconnect the battery earth strap.
♦ When working with brake fluid, observe the relevant safety
precautions and notes
♦ Always bleed the brake system (using brake filling and bleed‐
ing equipment - V.A.G 1869/- or VAS 5234 or similar) after all
work which involves opening the hydraulic system ⇒ Repair
group 47. Additionally perform high-pressure and low-pres‐
sure tests ⇒ page 83
♦ During the final road test, ensure that at least one ABS-con‐
trolled braking operation is performed (pulsations must be felt
at the brake pedal) ⇒ Vehicle diagnostic, testing and infor‐
mation system - VAS 505x- .
♦ Absolute cleanliness is required when working on the anti-lock
brake system; avoid any products that contain mineral oil,
such as oil, grease, etc.
♦ Thoroughly clean all connections and the adjacent areas be‐
fore loosening, but do not use aggressive cleaning agents
such as brake cleaner, petrol, thinners or similar.
♦ Place removed parts on a clean surface and cover them up.
♦ Carefully cover or seal open components if repairs are not to
be carried out immediately. (Use sealing plugs from repair kit
1 H0 698 311 A).
♦ Do not use fluffy cloths.
♦ Only remove replacement parts from packaging immediately
prior to installation.
♦ Only use genuine spare parts from original packaging.
♦ When the system is open do not work with compressed air and
do not move the vehicle.
18
Rep. gr.45 - Anti-lock brake system
⇒ page 17 .
.