I'm looking to swap in a 94 firebird rear end, posi and disc brakes. Gotta get a proportioning valve as I understand it and wondering a few things:

Would this work:

http://store.summitracing.com/defaul...=egnsearch.asp

Link won't work, not cool. Wilwood WIL-260-8419
Female 1/8inch NPT inlet and outlet


Can I put it right at the master cyl? What size are the fittings? I hope 1/8th. Anything I should do to the rear end before I put it in?

 

the rear will bolt in but it is physically wider and will require more backspacing to keep the wheels in the wells. For the brakes, just splice an adjustable proportioning valve into the single brake line that runs to the rear. You need to keep it so it is faily accessible for fine tuning. They say you shouldn't use compression fittings to join brake lines but I haven't had any problems whatsoever with my setup.

 

I wanted to have it come right out of the master cyl, come out in a hardlined fitting and then have the brake line go into the proportioning valve.

 

Unless your good with making your own hardlines and finding fittings and adapters, or unless you need the adjustability for the track or something, your easiest solution is a 1LE prop valve. That 1/8 end doesn't match to anything in the brake system.

The 1LE valves are available at the dealer for like $70 and it's plug and play - no days spent getting adapters and flaring lines - hell the 18 trips to the hardware store alone will cost you 2 days and $20 in gas just to figure out which adapters. I just did mine with a 1LE valve, and it brakes fine. Search TGO and you'll find the GM part #.

 

is the line out of the master cyl 1/8th? I wanted to put the valve right there and just do a straight line right into the prop valve if I could....

 

None of the brake lines will match the size of that wilwood adjustable prop valve - like I said, unless you need adjustability for something special, get a 1LE valve and be done.