High And Low Pressure Testing

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Special tools and workshop equipment required

Brake Pressure Gauge 0-250 bar VAG 1310A

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 VAG 1310A and bleed.

Fig 1: Brake Pressure Gauge 0-250 Bar VAG 1310A

Courtesy of AUDI OF AMERICA, LLC

-- Install the brake pedal loading device VAG 1869/2 between the brake pedal and driver seat.

Fig 2: Brake Pedal Depressor VAG 1869/2 Inserted Between Brake Pedal And Driver's Seat

Courtesy of AUDI OF AMERICA, LLC

-- 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 the brake pedal loading device VAG 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.