brake pedal leaking down

[Deezelcaddy]

so i blew the rear brake line today. got it back to the shop and bent a new modern art masterpiece that fit perfect...my lucky day. bled the brakes at all four corners. no air, no leaks, no problem. i have a hard pedal without the engine running but the pedal slowly leaks down to the floor with the engine running. re-bled all the brakes, same thing. i can't say for sure that i ever applied such strong, steady pressure to the brakes before so i am not sure if this is a new or existing thing. its time to ask the experts, again no leaks anywhere, fluid topped off, brakes bled,bled and re-bled, hard pedal off, leak to the floor brakes while running. i'm thinking master or booster but I'm not sure how to trouble shoot. thanx in advance

 

[justinray]

Pull the master to booster bolts, if brake fluid comes out, it IS the master.

 

['94IDITurbo7.3]

and if you have fluid leaking out of the MC like said above then fluid could have gotten in the booster which is destroy the diaphragm.

 

[justinray]

And that^

 

['94IDITurbo7.3]

and at that point you might as well just upgrade to hydro boost.

 

[riotwarrior]

And that^

Just sayin

 

['94IDITurbo7.3]

and man o' man. look what i started lol!

 

[Trying my best]

And if it is the master don't forget to bench bleed it.

 

[justinray]

^ true that.

 

['94IDITurbo7.3]

c'mon man. you messed up the "pattern" we had going here.