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 its
coding. ⇒ Vehicle diagnostic, testing and information system
- VAS 5051B- or -VAS 5052-
♦ 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 ⇒ page 25 .
♦ 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
⇒ page 129 . In addition, a high and low-pressure test should
be carried out on the brake system. ⇒ page 129
♦ During the final road test, ensure that at least one ABS-con‐
trolled braking operation is performed (pulsation must be felt
at the brake pedal). See ⇒ vehicle diagnostic, testing and in‐
formation system - VAS 5051B- or -VAS 5051B- .
♦ 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.
♦ After removal, place parts on a clean surface and cover them.
♦ Carefully cover or seal open components if repairs cannot be
carried out immediately. (Use sealing plugs from repair kit
1 H0 698 311 A).
♦ Only use lint-free 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.
Audi A6 2005 ➤ , Audi A6 Avant 2005 ➤
Brake system - Edition 04.2019
26 Rep. gr.45 - Anti-lock brake system
To Next Page
Loading...
