I just replaced front disc pads/rotor, rear break shoes and (of course) pedal goes to floor when engine running,and there's a hissing noise (inside cab,floor board around brake pedal, like a air leak)) I did bleed the brakes, and when engine is OFF, there is little play(in pedal) but when engine on pedal goes to the floor. Did I mess up something in the process? thinking maybe its the "power brake booster"?
master cyl seems OK, since it will pump fluid, when I bleed brakes

2001 /std 2 dr cab , 6 cyl,

 

So you properly bled the brakes right??

 

yep, but I'm gonna do it again with engine runnin, Read somewhere that works

 

I've always dont it that way. Try it for sure while its running

 

Did you adjust the rear brakes?

 

Nope just new pads

 

I replaced front disc pads/rotor, and rear brake shoes. I bled lines while engine running, and all is good now, Thanks for replies