Here is the setup: I use a Mustang master cylinder. I can't remember all the details but it is the second one I've installed in the car. The first one wore out the seal but it had never fully activated the rear brakes. I replaced the master cylinder with another and still no workee. I have 11,000 miles on the car and have never been able to lock the rear wheels on gravel. with the drums off you can see the shoes moving freely when depressing the brake. With the wheels off the ground and assembled you can not rotate the rear wheels by hand with brake applied but when driving it has virtually no effect. Last season I replaced the rear wheel cylinders, brake lines and hose. I replaced the brake shoes and am now stumped. I tried switching the lines front to back - no change. I do not have a proportioning valve as I obviously have no need to reduce pressure to the rear. Nor is there a residual valve on the rear line. I did have one but removed it. If I have someone push the pedal down I get a good amount of fluid out of the rear lines. they are clear and not clogged. I am hoping someone reading this can help clear up the problem. I don't want to drive another summer with no rear brakes. I have no problem stopping. I even tow a utilty trailer from time to time (you gotta see the looks on the guys faces at the garbage dump when I back her in. Please don't waste time telling me I'm wacked for towing a trailer. If you've seen my videos on Youtube then you have seen me racing at the track too. - I am already aware of my reckless ways (heh). My guess is that I will be advised to replace the master again. If so, should it be from a manual brake car or power? I think I have always used manual but can't remember. Thanks guys - The sun is going to be coming out in Seattle in few more months! Spooky