Foot brake valve, backup

This function is used to check the backup function in the EBS system.
EBS system active, Maximum pressure:
EBS system inactive, Backup mode active, Maximum pressure:
NOTE: The pressure in the rear circuit is about 200 kPa lower than in the front circuit.
Test prerequisites:
Procedure:
  1. Start the function.
  2. EBS system active. Press down the brake pedal fully and check that the wheel brake pressure is >= 850 kPa and that the trailer clutch pressure is >=650 kPa.
  3. Check the values.
  4. Activate backup mode.
  5. EBS system inactive. Press down the brake pedal fully and check that the wheel brake pressure is >= 650 kPa and that the trailer clutch pressure is >=650 kPa.
  6. Function complete.