Attention: if the car is equipped with EDS (Electronic differential lock), then the return pump must work to evacuate the air; for this, an ABS tester should be connected. Work for an auto repair shop.
Audi advises bleeding air while the engine is running. If this will happen in the garage, monitor the ventilation, because. high CO content is life threatening.
Fill the reservoir with new brake fluid, and during pumping, make sure that the fluid is topped up in a timely manner to a certain level. Otherwise, air will enter the tank again.
Remove the dust cap from the bleed valve (work sequence: rear right; rear left; front right; front left).
Put on a transparent band (e.g. windscreen washer hose type) on the valve wiped clean and lower its free end into a container partially filled with brake fluid.
Have an assistant pressurize the system by depressing the brake pedal.
Open the vent valve on the respective wheel about 1 and a half turns and release the pressure. At the same time, the assistant squeezes and releases the pedal with his foot.
Close the valve and pressurize again.
Open the valve as already done.
Repeat this process until no more air bubbles are visible in the hose. (If the hydraulic system is significantly empty, bleed twice.) Thus, brake fluid and, of course, air are pumped through the valve.
If no more air bubbles are visible, then have an assistant keep the brake pedal fully depressed while you close the valve. Tighten carefully, otherwise the threads may be stripped!
Bleed the brakes of the other wheels in the same way.
To bleed the brake system of the rear wheels, firmly press the lever at the brake pressure regulator in the direction of the brake spring.
Bleeding the brake system in the front disc brake caliper: bleeding valve (1) opens with a 7 mm key. The valve has a transparent hose (2), which diverts the pumped liquid into a prepared container (3).
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