I have a 93 F150. I had several brake lines break. I replaced the back passenger from the block over to the rear passenger wheel cylinder. I was bleeding the brakes and the long line from front to back brakes broke. I replaced it and began to bleed brakes again. The bleeding on driver rear cylinder broke off. It is not leaking fluid, but can not bleed the line. Blead all other lines but pedal still goes to the floor. I can pump it up, but after sitting for a few minutes, it goes right back to the floor. Any suggestions? Will the one not being blead cause this or is it the master cylinder and booster?

Thanks for the help...Kevin

 

you need to replace the rear cylinder.

it is the air in that line.

master may or may not be ok.

fix the wheel cylinder first.