For those a little brighter than myself, could someone that knows please explain this system a little better for me. There are several detent positions when setting the Parking brake for a Hawker 900XP/750 and I assume 800/850XP. One knotch after the Emergency position will actually set the parking brake but you can pull it back to the far aft position ( one more knotch )for maximum parking brake effect. To be honest, I only thought there were 3 positions using the parking brake lever; off, emergency and parking. Why would you have that middle detent parking brake position after the emergency position? I have looked in the FSI aircraft manual and read and re read the Parking brake system, but it doesn't quite explain the entire system. Anyone care to explain.