BRAKES...Arrrrrgh

[Little Red]

After replacing all the lines from the front to the rear discs I had a pedal that would go to the floor. I bled them several times with a mighty vac. and even replaced the master cyl which I bench bled.I have good pedal when the engine is off but when I start it up the pedal is mushy and can easily go to the floor. I must have run a gallon of fluid through it and even bought speed bleeders. No improvement. 2 questions... what are your thoughts on this and which port on the master cyl. controls which line is which. Thanks...2000 F150 4x4 4.6 engine.Thanks

 

[armadillon]

Sounds like a crap master cylinder.

 

[brinker88]

Calipers on the wrong sides? Bleeder needs to be on top.

If so, I would have someone pump the pedal and you open the bleeders.

If that doesnt work, I'd try a new MC. I just had the same problem you're having.

 

[Little Red]

Thanks guys. My orig. master cyl. blew out apparently when the line blew. I replaced the original that was bad and now it seems the new one is crapola too. I'll get another one and see.

 

[Little Red]

Well, I got the brakes working. Turns out I was sold the wrong m.c.

 

[shane96ranger]

Well, I got the brakes working. Turns out I was sold the wrong m.c.

Went to Autozone, eh?

 

[Little Red]

Believe it or not, NAPA.