Leak Test

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 : VAG1310A  and bleed.

-- Insert the : VAG1869/2  between the brake pedal and driver seat. Apply pressure to the brake pedal until the pressure gauge indicates a pressure of 50 bar (725.18 psi). The pressure must not drop more than 4 bar (58.01 psi) during the test period of 45 seconds.

Fig 1: Brake Pedal Depressor VAG 1869/2 Inserted Between Brake Pedal And Driver's Seat

Courtesy of AUDI OF AMERICA, LLC

-- Replace the brake master cylinder if the pressure decrease is too high.

Low Pressure Testing:

-- Set the brake pedal actuator back far enough that the pressure gauge indicates 6 bar (87.02 psi) positive pressure.

-- The pressure must not drop by more than 1 bar (14.5 psi) during a test period of 3 minutes.

-- Replace the brake master cylinder if the pressure decrease is too high.