High And Low Pressure Testing
Special tools and workshop equipment required
- Brake Pressure Gauge 0-250 Bar V.A.G 1310A
- Brake Pedal Actuator V.A.G. 1869/2
The hydraulic brake system must be bled.
Only install genuine parts or components approved by Audi in the brake system.
The if the brake fluid replacement interval specified by Audi is exceeded, replace the brake fluid.
Check the system visually for leaks.
Fix leaks and remove dirt on the hydraulic system.
Before Beginning
Check brake system (brake master cylinder, brake hoses, brake lines and brake calipers) for proper seal and function.
High Pressure Testing
-- Remove bleeder screw at one of the front brake calipers. Connect V.A.G 1310A and bleed.
-- Install V.A.G 1869/2 between the brake pedal and driver 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.
If pressure drop is large, replace hydraulic unit.
Low Pressure Testing
-- Push V.A.G 1869/2 back until the pressure gauge indicates 6 bar positive pressure.
-- The pressure must not drop by more than 1 bar during a test period of 3 minutes.
If pressure drop is large, replace hydraulic unit.