Bleeding brake system — AUDI

Attention:
Never allow brake fluid to come into contact with liquids containing mineral oil (oil, petrol, cleaning agents) as mineral oils would damage the plugs and collars in the brake system.
Brake fluid is poisonous and is never to be sucked off by mouth with a hose. On account of its corrosive effect it must also not be allowed to come into contact with paintwork.
Brake fluid is hygroscopic, i.e. it absorbs moisture from the atmosphere and is therefore always to be kept in containers with an air-tight seal.
Observe disposal regulations.

Special tools and workshop equipment required

Brake filling and bleeding appliance V.A.G 1238 B or V.A.G 1869
Collector

ABS tester V.A.G 1710

Notes:

Make exclusive use of fresh brake fluid as per US Standard
FMVSS 116 DOT 4.
Genuine VW/Audi brake fluid complies with this specification.
Rinse off any brake fluid which escapes using copious amounts of water.
Do not work with compressed air and do not move vehicle when system is open.

Bleeding brake system using brake filling and bleeding appliance V.A.G 1869

Connect up V.A.G 1869.

Whilst bleeding rear brake, press lever of brake pressure regulator firmly towards axle beam -arrow-.
Open bleed valves in specified sequence and bleed brake calipers.

Bleeding sequence for vehicles not fitted with EDL

1 -
Rear right brake caliper
2 -
Rear left brake caliper
3 -
Front right brake caliper
4 -
Front left brake caliper

Close bleed valves.
For vehicles fitted with ABS, make sure that at least one ABS- controlled braking operation (with noticeable pulsing of brake pedal) is carried out during the concluding test drive.

Bleeding sequence for vehicles fitted with EDL

1 -
Suction pipe for EDL, bleed valve -Item
45-11
at hydraulic unit
2 -
Rear right brake caliper
3 -
Rear left brake caliper
4 -
Front right brake caliper, however additionally connect up ABS tester V.A.G 1710 => Page
47-33
and allow return pump to run
5 -
Front left brake caliper

Close bleed valves.
For vehicles fitted with ABS, make sure that at least one ABS- controlled braking operation (with noticeable pulsing of brake pedal) is carried out during the concluding test drive.

Connecting ABS tester V.A.G 1710 to control unit

Remove rear seat backrest.

=> General Body Repairs, Interior; Repair Group 72; Rear Seat; Removing and installing rear seat backrest
General Body Repairs, Interior
Rear Seat
Removing and installing rear seat backrest

Disconnect control-unit plug after releasing clip -arrow 1-.

Note:

Always switch off ignition before unplugging or attaching ABS control-unit connector.

Connect ABS tester V.A.G 1710 to wiring harness.

Set program switch -1- on V.A.G 1710 to position 3.
Switch on ignition.
Press button -2- until bubble-free brake fluid emerges at bleed valve at front right brake caliper; ABS return pump must be heard to run.

Make sure this procedure does not last more than 60 seconds. A cooling phase of at least 5 minutes must be allowed after 60 seconds.
Repeat this bleeding procedure until bubble-free brake fluid emerges.