Audi Workshop Service and Repair Manuals

Before you begin:

Make sure that the brake system (master brake cylinder, brake hoses, brake pipes and brake calipers) works properly and is free of leaks.

High pressure test:

• ‒ Remove bleeder screw at one of the front brake calipers. Connect pressure gauge -V.A.G 1310- or V.A.G 1310A and bleed.
• ‒ Insert brake pedal depressor 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. Replace hydraulic unit if drop in pressure exceeds the above figure.

Low pressure test:

• ‒ Move the brake pedal depressor back until the pressure gauge indicates a pressure of 6 bar.
• ‒ The pressure must not drop by more than 1 bar during the test duration of 3 minutes.

Replace hydraulic unit if drop in pressure exceeds the above figure.