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Servicing brake caliper - FN-3 brakes > < Leak test performed by operating brake

A4 Mk3

High-pressure and low-pressure tests
High-pressure and low-pressure tests
Special tools and workshop equipment required
   
t  Tester for brake pressure regulator -V.A.G 1310A-
Before starting:
Make sure that the brake system (master cylinder, brake hoses, brake lines and brake calipers) works properly and is free of leaks.
High-pressure test:
  W00-0562
–  Remove bleeder screw at one of the front brake calipers. Connect tester for brake pressure regulator -V.A.G 1310A- and bleed tester.
  V47-0133
–  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 hydraulic unit if drop in pressure exceeds the above figure.
Low-pressure test:
–  Move the brake pedal actuator -V.A.G 1869/2- 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 hydraulic unit if drop in pressure exceeds the above figure.
  A44-0020

Servicing brake caliper - FN-3 brakes > < Leak test performed by operating brake