brakes not 100% yet

does this happen when you have run the car for a while and the car is warm? fi it is its called brake fade and id replace your master before you lose your brakes all together., but if not then its possible its an airlock and you just need to rebleed your brakes .. your aware how right.. rr, lr, rf, lf..

and i just put the disks i have on my 66 so i know all the problems you have.. it sucks but stick it out.. when you decide to get disks its WAYY better stoppin' power..
wish ya luck
Cerwin