Checking motor-and-pump assembly cycling points - AR42.50-P-0001-07MB

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.

   Read the motor-and-pump assembly's pressure at deactivation from the pressure gauge.

   If the pressure lies between 172 and 190 bar:

   System OK.

   Pressure < 172 bar or >190 bar:

   Malfunction in motor-and-pump assembly.

3. Switch off ignition.
4. Depress brake pedal to reduce reservoir pressure to 138 - 144 bar.
5. Switch on ignition and note whether motor-and-pump assembly starts to run.

   Motor-and-pump assembly starts: System OK.

   Motor-and-pump assembly fails to start:

   Malfunction in motor-and-pump assembly.

6. Switch off ignition.