Hey, Grigg, me again, about Hydro-Vacs this time.
The 1987 Suburban 3/4 ton Diesel has Hydro-Vac. (My wife checks it every morning to make sure it hasn't moved to the 1951.) I've never liked the feel of those brakes, but they sure do stop.
The system has drum brakes front and rear, and the rear shoes were installed by a GM certified mechanic. Unfortunately, he is my step son, so I have my suspicions.
Anyway, the thing that bothers me is that there are a few degrees of free play in the pedal and then it acts like the brake drums are not round. The pedal doesn't move, but the stopping action is kind of 'lumpy' for want of a better word. Its been like that ever since we've had it.
I'm 90% sure that this is not a Hydro-Vac issue, but you've driven ones that actually work. Have you ever run into anything like this?
I also suspect that I might need to find out what the bleeding operation consists of. We think that the truck has 242,000 miles on it, with only a transmission re-build, but we aren't sure.
The PO said that he had hauled a 5000 pound boat back and forth to Florida, from St. Louis, MO, many times (one of the reasons I was daring enough to try to haul the 1 1/2 ton home with it, and it is probably also why it has that lace effect around the lower body.)
