I have a 1979 itasca sundancer class c. its on a chevy p30 chassis. after about a 2 to 3 miles of driving, my front brakes start to apply pressure until the motorhome wont move anymore. all this by itself. a hanndy little feature that keeps me from driving it has hydro boost braking system. has anyone heard of or experienced this problem. are there any solutions out there short of spending every last penny that i have to overhaul the entire brake system? any help is much appreciated.