Connect the control pressure gauges as when adjusting the pressure regulator.
Remove air from the hoses of both pressure gauges through the pressure gauge bleed screws.
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.
Checking the tightness of the pressure regulator (Audi 80 B2)
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