My ford truck at work had it, you lose the belt on the pump and alot of interesting things happen. I was told GM uses it on their larger trucks too. I hated the furd brakes, if you had a panic stop they almost went to the floor then came back up. Our mechanic told us it was normal...super-duty F350 bucket truck w/460 gas motor.(Verizon splicer) It wouldn't be my first (or second) choice.