I have a '91 Chevy Suburban 1500, 2x2, 5.7L with rear anti-lock brakes. I have always believed the brakes to be inadequate for this heavy vehicle, as the front brakes wear excessively. Presently, when I apply pressure to the pedal, the truck yanks *hard* to the right. Once I release the pedal, the truck swings back *hard* to the left. I have had the brakes worked on lately, but they couldn't correct the problem. They replaced calipers, pads, adjusted rear brakes, and replaced the worn rt. rear emerg. brk. cable. They said that they didn't know enough about the Proportioning valve and metering valve to diagnose them. I did some checking on the net and reasoned that one of those valve might be the problem. However, a co-worker mentioned that the rubber line from the hard line to the calipers might have collapsed internally causing fluid pressure to remain in the line, which would cause the situation that I am experiencing to occur.
Any thought?
Thanks folks!
Mark