Checking For Leaks
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Special tools and workshop equipment required
- Brake Pressure Gauge VAG1310A
- Brake Pedal Actuator VAG1869/2.
High pressure testing:
- Brake system (brake master cylinder, brake hoses, brake lines and brake calipers) tested for function and leaks.
-- Remove bleed screw at one of the front brake calipers. Connect the Brake Pressure Gauge VAG1310 A and bleed.
-- Insert the Brake Pedal Actuator VAG1869/2 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.
Replace master cylinder if pressure drops greatly.
Low pressure testing:
-- Set the brake pedal actuator 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 drops greatly.