No Brakes

[McDizzle]

Well last weekend I replace the rear brakes calipers, pad and rotors bled it and drove it all week long about 300 miles with no issues. Then last night I jumped in the truck and started it and took off and hit the pedal and nothing pedal went to the floor before I got very little pedal to stop. So I released the pedal and hit it again it was fine then repeated the process nothing hit it again fine, so I parked it. Came home from work today drove it around the block nothing at all this time....... I looked under the truck no leaks of brake fluid, checked the fluid level it was full so what going on? Is it my vacuum pump?

 

[JLDickmon]

I'd say you got a hunk of crud sucked through the master cylinder..
have you ever rebuilt one? if so, pulling it apart to check the bore condition would be easy..
if not, I'm not sure taking the old one apart before a new one is installed and bled through would be the best course of action....

 

[McDizzle]

found its my hydraulic line from the powersteering pump to the hydroboost had a hole worn in it from the shock tower and i lost all my pressure.

 

[JLDickmon]

bogus