The vehicle Parking Brakes have not released as expected.
- The vehicle Parking Brake should release (LED Extinguishes) at 5.5 Bar rising Main Reservoir Pressure. Check MR Pressure.
- If MR Pressure is sufficient continue to build MR air to 7.6 Bar and recheck Parking Brake fault light.
- It is possible for the Parking Brake pressure switch to pneumatically drift generating this fault scenario. Check switch at Brake Frame.
- A Rotational test should be considered to validate the fault indication. Reference DOTE if the unit is in service.