hey guys, my buddy having problems with his 93 4wd brakes every things new expert the calipers. you have to put all your body weight on them to make truck stop,and some time you have to pump them.so I'm guessing its a bad brake booster, or line leaking.but i figured i ask y'all thanks Wesley.

 

has he checked all the vacuum lines? had one come off on mine and it did the same thing. if not, my guess would be the booster as well.