Ok so I replaced the booster and master cylinder and there is no leaks but I still have to pump the pedal to get pressure and at a stop the pedal loses pressure and it's losng fluid somewhere

 

That's probably been you problem the whole time, have to inspect the hard line for a pin hole leak. A line must have cracked on you. Double check all fittings and that the bleeders are tight.

 

Yeah , I would suspect the lines as well ... probably why they ditched he ambulance n the first place ...

 

yeah I'm having a similar problem..was traveling on the interstate and went to get off exit and brakes went all the way to the floor..tried pumping them a few times but same thing happened all the way to the floor. So I parked the truck and checked brakes while it was turned off they are stiff now and no sign of any leaks. Not sure what the problem is or where to start looking...Please Help!?!

 

Check to make sure your factory ( rubber) lines are not bulging when under pressure ... I persoanlly replaced all mine with SS flex lines ... works almost too good at times now .... Brake check any one ...