Unscrew the air bleed nipples from the left front wheel brake caliper and from the wheel cylinder (on vehicles with rear drum brakes) or from the support (on vehicles with rear disc brakes) brake mechanism of the right rear wheel and screw in the fittings of the control pressure gauge hoses in their place.
Bleed air from both gauge hoses.
Press the brake pedal until the pressure gauge attached to the front wheel brake mechanism shows a pressure of 100 kg/cm².
Maintain this pressure for 5 seconds. During this time, the readings of the pressure gauge attached to the rear wheel brake mechanism may change by no more than 10 kg/cm². If the pressure has changed by a greater amount, replace the pressure regulator.
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Checking the tightness of the pressure regulator (Audi 100 C3)
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