Check cockpit warning displays - AR42.50-P-0001-05MB

The ignition must be switched off.

1. Release pressure from booster circuit (depress brake pedal approximately 30 times).
2. Start engine.
3. Observe pressure gauge along with the corresponding status messages displayed in the instrument cluster. At approximately 135 bar the message "BRAKE SYSTEM - WAIT - PRESSURIZATION!" should go out.

   Message goes out: System OK.

   Message remains in display: ESP control unit or vehicle electrical system defective.

4. Switch off ignition.
   Fig 1: Checking Cockpit Warning Displays