Leak Test

WARNING: This page is about a different car, the 2024 Audi SQ7, 2024 Audi Q7, 2023 Audi SQ7, and 2023 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Brake Pressure Gauge:VAG1310A

Fig 1: Identifying Brake Pressure Gauge
Courtesy of AUDI
Brake Pedal Actuator:VAG1869/2 .

Fig 2: Identifying Brake Pedal Actuator
Courtesy of AUDI

High Pressure Test:

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

-- Remove the 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 -A- between the brake pedal and driver seat. Apply pressure to the brake pedal until the pressure gauge indicates a pressure of 50 bar (725.19 psi). The pressure must not drop more than 4 bar (58.02 psi) during the test period of 45 seconds.

Courtesy of AUDI

-- 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.