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Servicing clutch release mechanism > < Removing and installing master cylinder

A4 Mk2

Bleeding clutch system
Bleeding clutch system
Special tools and workshop equipment required
   
t  Brake filling and bleeding equipment -VAS 5234- or
  W00-1101
t  Brake filling and bleeding equipment -V.A.G 1869-
Brake fluid specification → Rep. Gr.47.
Procedure
  Note
t  The clutch system must be bled after performing work on the hydraulic clutch mechanism.
t  Before bleeding the clutch system, pull out clutch pedal and top up brake fluid to “Max” marking on brake fluid reservoir.
t  Do not allow brake fluid to come into contact with the gearbox. If necessary, clean the gearbox housing.
t  Open the bleeder valve before switching on the bleeding appliance.
–  Connect brake filling and bleeding equipment -VAS 5234- or -V.A.G 1869- to brake fluid reservoir, but do not switch on at this stage.
  W00-0457
–  If fitted, loosen fasteners -1- and -2- and remove rear noise insulation -B-.
  A34-0530
–  Connect bleeder hose -A- to slave cylinder -arrow- and open bleeder valve.
–  Connect bleeder hose to pressure hose of collector bottle.
–  Switch on bleeder appliance and allow about 100 cm3 of brake fluid to drain out.
l  Operating pressure: 2.5 bar
  Note
Ensure bleeder hose is correctly fitted during bleeding operation.
–  Close bleeder valve. Tightening torque 4.5 Nm.
–  Depress clutch pedal several times after bleeding process is completed.
–  Bleed system once again if necessary.
–  Disconnect bleeder hose and fit protective cap.
–  Remove brake filling and bleeding equipment -VAS 5234- or -V.A.G 1869- from brake fluid reservoir.
–  If fitted, install rear noise insulation.
  N30-0205

Servicing clutch release mechanism > < Removing and installing master cylinder