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Servicing front brake calipers > < High-pressure and low-pressure tests
Tests
Tests
Special tools and workshop equipment required
   
t  Tester for brake pressure regulator -V.A.G 1310A-
  W00-0562
t  Brake pedal actuator -V.A.G 1869/2-
High-pressure test:
  Note
Make sure that the brake system (master cylinder, brake hoses, brake lines and brake calipers) works properly and is free of leaks.
–  Screw out bleeder screw at one of the front brake calipers. Connect tester for brake pressure regulator -V.A.G 1310 A- and bleed.
–  Insert brake pedal actuator -V.A.G 1869/2- between brake pedal and driver's seat. Apply pressure to brake pedal until the gauge indicates a pressure of 50 bar. The pressure must not drop by more than 4 bar during the test period of 45 seconds.
Renew brake master cylinder if drop in pressure exceeds the specification.
Low-pressure test:
–  Move the brake pedal actuator back until the pressure gauge indicates a pressure of 6 bar.
–  The pressure should not drop by more than 1 bar within the test period of 3 minutes.
Renew brake master cylinder if drop in pressure exceeds the specification.
  W00-0679

Servicing front brake calipers > < High-pressure and low-pressure tests