i am stuck, can someone please help w/brakes

[leakinposchevy1988]

i got this truck its a 88 z71 with jacked up brakes! it only stopes in the rear, i bled the whole system (had the combination pin blocked) it gained a little pressure but when i start the car i can press the brake and the idle changes, and it goes 1/2 way to the floor.


i dont know how to use these forum this ill check back in a little while.
thanks jeff

 

[justhorsinaround]

Do you hear a sound like whistling air or running water? Bet you have a bad brake booster if you do.

 

[sweetk30]

have someone watch the master with cap off to see if it spits fluid up when the pedel is pushed. and it sounds like master.dont forget the frt section is rear and the back is frt.