I have a 91 RS so it has the regular brakes not the PBRs and I bought a disk/posi rear end out of a 84 Z28 a few months ago so it has the same style brakes as the front. The brakes still scare me sometimes though and my dad's 94 Sierra 1500 with 286k miles on the clock can stop better than my car so I'm hoping that the problem is 50% that the brakes were shitty to start with and 50% that it's the prop valve. I called the dealer and the prop valve for the 84 Z is discontinued and Napa doesn't have it either. What prop valve can I use??

Umm you should be able to use a proportiong valve out of any fbody that has rear disc brakes

Try the following link for some part numbers:

https://www.thirdgen.org/forums/brak...t&pagenumber=3

If you want better braking power, concentrate on the fronts. Here's an idea for the rears:

https://www.thirdgen.org/forums/faq-...iscs-89-a.html

JamesC

I can't afford new brakes right now but when I can (won't be for a while) I'm getting the LS1 brake kit from whatever web site it is that I can't remember right now (big brakes or something like that).

i am doing the same thing what all do you need other than the stuff on the rear end? pm me