I have a 2005 F350 Crew Cab Long Bed, and have been having problems with the parking brake for over 2 years now. It's getting worse, so I decided it's time to try and figure it out. When I go to set the parking brake, it usually goes to the floor. But, if I release it, then reset it, it will usually grab. Sometimes it take setting, releasing, and resetting a few times for it to grab. When it grabs, it holds strong, and starts to grab the brake at about 1/4 - 1/2 way through the pedal stroke. Any ideas what could be causing this? All 4 brakes are relatively new...