Bleeding Brake System; Bleeding Sequence For Vehicles With Electronic Stabilisation Program (Esp) - Audi A8 2003 Workshop Manual

Audi A8 2003 ➤
Brake system - Edition 03.2013
7

Bleeding brake system

WARNING
♦ Do not under any circumstances allow brake fluid to come
into contact with fluids that contain mineral oils (e.g. oil,
petrol, cleaning agents). Mineral oils damage the plugs
and seals in the brake system.
♦ Brake fluid is poisonous and must NOT be drawn off by
sucking through a hose. Because of its caustic properties
it must also not come into contact with paintwork.
♦ Brake fluid is hygroscopic, i.e. it absorbs moisture from the
surrounding air, and should therefore always be stored in
airtight containers.
♦ Brake fluid flushed out during the bleeding process must
not be re-used and must be disposed of in the proper
manner.
♦ Always observe the relevant environmental regulations for
disposal ⇒ page 17
Note
Only use new brake fluid conforming to US standard FMVSS
♦
116 DOT 4.
Genuine VW/Audi brake fluid conforms to this specification.
♦
Do not use liquids containing silicone.
♦
Avoid contamination of brake fluid with any dirt particles or bits
♦
of fluff (e.g. from cleaning cloths etc.).
Rinse off spillages using plenty of water.
♦
When the system is open do not work with compressed air and
♦
do not move the vehicle.
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).
7.1 Bleeding sequence for vehicles with
Electronic Stabilisation Program (ESP)
Applies to steel and ceramic brakes.
Unlike ESP 5.3, ESP 5.7 does not incorporate hydraulic pump -
V156- . It is therefore not necessary to bleed the pre-charging
pump with the diagnostic tester.
Note
A pressure of at least 2 bar is required for bleeding the hy‐
♦
draulic unit. For this reason it is important to always check the
pressure setting on the bleeder unit.
Only use the brake pedal actuator when installing brake sys‐
♦
tem components, and bleed the system afterwards.
Special tools and workshop equipment required
110
Rep. gr.47 - Brakes - hydraulics
.
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