High and low pressure testing
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Before starting:
Make sure that the brake system (master cylinder, brake hoses, brake lines and brake calipers) is free of leaks.
High-pressure test:
- Remove bleeder screw at one of the front brake calipers. Connect brake pressure gauge 0-250 bar V.A.G 1310A and bleed tester.
- Start engine.
- Insert brake pedal depressor between brake pedal and drivers seat. Apply pressure to brake pedal until the gauge indicates a pressure of 50 bar.
- Switch off engine.
- The pressure must not drop by more than 4 bar during the test period of 45 seconds.
If pressure drops by more than 4 bar, inspect brake system for leaks and repair as required.
Low-pressure testing:
NOTE:
- Only perform low-pressure test if result of high-pressure test is OK.
- Adjust brake pedal loading device so that pressure gauge reads 6 bar positive pressure.
- The pressure must not drop by more than 1 bar during test period of 3 minutes.
If drop in pressure exceeds specification: replace ABS hydraulic unit.