High and Low Pressure Testing

High and Low Pressure Testing

Special tools, testers and auxiliary items required

• Brake pressure gauge 0-250 bar (VAG 1310A)

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 the bleeder valve at one of the front brake calipers. Connect brake pressure gauge 0-250 bar (VAG 1310A) and bleed tester.





- Start the engine.

- Insert the brake pedal depressor between the brake pedal and the driver's seat. Apply pressure to the brake pedal until the gauge indicates a pressure of 50 bar.

- Switch off the engine.

- The pressure must not drop by more than 4 bar during the test period of 45 seconds.

If the pressure drops by more than 4 bar, inspect the brake system for leaks and repair as required.

Low Pressure Testing

• Only perform the low pressure test if the results of the high pressure test is OK.

- Adjust the 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 the drop in pressure exceeds specification: replace the Antilock Brake System (ABS) hydraulic unit.