Is there any way to test my proportioning valve out of my 69, It is not hooked up to the brakes I'm just putting car back together after a total frame off. and I'm just now running new lines. Any help would be appreciated. There is a 1971-72 proport. valve for sale in year one, would this work on my 69 with front disc, rear drum? Thanks Dusty

The 71-72 combo valve will work, just need the lines for a 71-72. As for testing the original, I just blew it out with air and it works fine.