brakes overheat bigtime but i replaced everything

[jazzzmonky]

I have a 1988 ford bronco fullsize and the brakes overheat HORRIBLY. I bought it about a year ago as a project. It has about 88000 miles. Here is where I am stumped. Because of the excessive overheating I repalced the pads, rotors, calipers, lines, master cylinder, porportioning valve, and repacked the bearings all just in the front. The rear has never given me problems. Only the front overheats.

[cougarman]

I recall a couple full size Ford cars doing that . We found that the booster was sticking. We pulled up on the brake pedal with our toe and the problem went away. If we didn't, the pedal didn't return by itself.
Road test and try it.
One Question . Do both your front brakes overheat or just one side ?

[jazzzmonky]

thanks for your help. it's both sides. once they got hot enough that the switch for the manual locking hubs melted. If the problem is that the booster is sticking is there a fix for that? maybe some lube?