A friend of mine was having a tough time steering his D60, so he called Matt at West Texas Off Road and got the procedure for increasing his power steering fluid pressure and volume. All was well, truck steered great, untill he hit the brakes one time and the pedal stayed on the floor and the brakes were locked. If he pulls the pedal up off the floor the brakes let off. This doesn't happen all the time, just once in a while. When the brakes are locked, the steering is still OK. The truck is an '82 Blazer, 6.2D with Hydro Boost. Any ideas?