You could try this,remove the lines from the master cylinder,or really just break them loose one at a time as somebody holds the pedal down,does it squirt fluid?If not,its your master cylinder,maybe.If it does squirt fluid,and you say there is no bleeder on the booster?Have somebody pump the pedal,then hold it down and you break the line loose going to the booster.If you dont have any fluid there,its your master cylinder,if you do,break the line on the other side of the booster and see if you have pressure.Keep on like this untill you get to a back wheel.If you have pressure to a back wheel,but pedal goes to the floor,its either the master cylinder is not working,or could be plugged up with crud,the new booster is leaking internally,(probably not)there is a wheel cylinder leaking and you cant tell which one yet,(not likely).Pressure bleeding can help if you are by yourself.If you start the motor does it get pedal?If it did that would be a sign of a trapped air bubble in the lines.I have done this before,just fill your master cylinder with fluid,then crack the bleeder loose on the longest line,with a dual system the longest other line too,and let it drip or just barely a little fluid come out.After a few hours check and make sure you dont run out of fluid in the master cylinder,then tighten the bleeders,and for me it worked and I had pedal.Somehow,if you have a lot of kinks in the lines it can trap air in there and that was the only way I could get it out.Most likely its your master cylinder,but the motor would need to be running to get the full effect of the booster and all on your pedal.You might not ever get real good pedal until the motor is running,but it should stop before it gets to the floor.My guess is the master cylinder,pull it if you dont have pressure and clean it,look for a hole in the bottom of the chambers for fluid that is full of crud.If its real clean,I would say replace or rebuild it like lots of others said too.If you are lucky,you might just clean it up and maybe put a kit in it and fix it.The trouble is trucks with brakes like that set a lot of the time and moisture collects in the bottom of the wheel cylinders and the master cylinder and corrodes into the metal.It doesnt take very much corrosion and they get to where they wont build pressure,or get stuck in the bore solid as a rock.If it sets a lot,changing the booster and the master cylinder might just be the start,you might have to fix more problems.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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