hey guys im having problems with my brakes on my 71, 40. lil while back did a disc brake conversion got a new master cyl from checker(76) .the problem is they dont turn off ? once you hit them once or twice the pressure builds an it is like riding your brake all the time im at my wits end why would it keep pressure in the sys, things i have tried fliped the check valve shortend the linkage it is not draging if you break the line loose at master all the pressure goes away till a few pumps