I recently swapped a 88 GTA 10 bolt disc brake rear in my 91 RS 5.0L. Do I need to change the proportioning valve or master cylinder? Does anyone make the steel brake lines, already bent, that are on the rear?

 

I tried to find a new steel line that ran along the rear end and could only find them in a complete aftermarket set which was big bucks. I made my own, but you need a double flare kit tool to do the ends and a bender. I had to use the old mounting connector block and ends as I could not locate them at parts stores. As for the MC and Prop. valve, I'm not sure if they are different. Go to your local auto parts and have them check application for both year vehicles.I f the numbers match or are different, well theirs your answer. Hope this helps. Badman

 

Your master is fine but you do need a different prop, P/N 10136840. I have one in stock and also any brake lines you need for the swap on hand, LMK.

Ed

 

Can I use the prop valve I removed from the GTA? What is the price of your valve and/or brake lines?