Did the PO install the wrong master when “fixing a leak”. I replaced a leaking drum cylinder in the rear so I am not losing fluid anymore. The shoes are new but I keep locking up my rear wheels going super slow and it is driving me nuts. My tires are older than I wish they were but I don’t think they are the problem. I can lock up the rear wheels at about two miles per hour and these tires howl really bad. I have tried backing the adjusters off the back but it hasn’t helped. It is a 1969 and has drums on all 4 corners.