AR42.50-P-0001-09MB Leakage Check

AR42.50-P-0001-09MB Leakage Check
-MODEL 220.175 /178
- with CODE (Z07) Top protection
-MODEL 463.236 /248
- with CODE (979) Special protection version

The ignition must be switched off.

1 Release pressure from booster circuit (depress brake pedal approximately 30 times).
2 Switch on the ignition and wait until the motor-and-pump assembly is deactivated.
3 Switch off the ignition and record the pressure.

Do not operate brake pedal.

4 Wait 30 minutes then switch the ignition back on.

Pressure loss <20 bar and motor-and-pump assembly does not restart: System OK.

Pressure loss >20 bar and motor-and-pump assembly starts to run:

Brake booster hydraulic unit is defective.