Hydraulic System: Testing and Inspection

High and Low Pressure Testing

Special tools, testers and auxiliary items required

• Brake pressure gauge 0-250 bar (V.A.G 1310A)

• Brake pedal actuator (V.A.G 1869/2)

High Pressure Testing

• Brake system (brake master cylinder, brake hoses, brake lines and brake calipers) tested for function and leaks.

- Remove bleeder screw at one of the front brake calipers. Connect (V.A.G 1310 A) and bleed.

- Install (V.A.G 1869/2) between 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.

Replace master cylinder if pressure drops greatly.

Low Pressure Testing

- Set the brake pedal loading device back far enough that 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.

Replace master cylinder if pressure drop is greater.