Hydraulic System: Testing and Inspection

High-Pressure and Low-Pressure Tests

Special tools, testers and auxiliary items required





^ Tester for brake regulator V.A.G. 1310/A





^ Brake pedal handle V.A.G. 1869/2

Test Prerequisite:

^ Brake system (brake master cylinder, brake hoses, brake lines and brake calipers) tested for operation and tightness.

High-Pressure Test:

- Remove bleeder screw at one of the front brake calipers. Connect pressure gauge Tester for brake regulator V.A.G. 1310/A and bleed.
- Insert Brake pedal handle V.A.G. 1869/2 between brake pedal and drivers seat. Apply pressure to brake pedal until the gauge indicates a pressure of 50 bar. The test lasts for 45 seconds, during which time the pressure must not drop by more than 4 bar.

If the drop in pressure is greater, replace the hydraulic control unit.

Low-Pressure Test:

- Move the brake pedal depressor back until the pressure gauge indicates a pressure of 6 bar.
- The test lasts for 3 minutes, during which time the pressure must not drop by more than 1 bar.

If the drop in pressure is greater, replace the hydraulic control unit.