Hey guys i have been fighting with me front brakes on my 71 Super Bee eveytime i drive it (which isnt far because of the issue i have been having.

I bought a complete brake line setup so they are all new along with a front proportion valve. My front disc brakes seem to lock up on me everytime i drive. I am not sure if its the calipers or the prop valve. If i crack the bleeders on the front i can then push the car then re bleed them and it works fine for a short time until it does it again. What would you suggest i do?

I was thinking of finding an original front prop valve but didnt know if it could be a possible caliper issue as they were used. But they do retract when you crack bleed valve?

THanks,

Steve