I have bench bled a new master cylinder and bled all lines. Brakes will work but pedal travels to the floor. Any suggestions?
Still air in system, sounds like the master cylinder has ran dry during the bleeding process, pumping more air into system. The lines running to the rear brakes are long, so you must bleed the fluid out the bleed screw in the rear 10+ times each side. Bleed, bleed, and bleed some more, keep bleeding untill that pedal feels good.
SOURCE: Is the brake booster going out?
Let me know what you find out. I get the same whoosh/pedal travel, and at this point have NO braking at all. I am also losing fluid nearly as fast as I can put it in if I use the brakes, but I can't find where it's coming out. I even drove on clean snow and don't see any fluid tracks...
Oddly enough if you are going to do it yourself, gmpartsdirect seems to have the best prices for OEM parts.
I am assuming that my rusted/pitted brake lines have failed me. Aaahhh the old money pit.
SOURCE: 2005 f150 spongy brakes
it sounds like your still not getting all the air out of your lines. it helps to have a brake bleeder but they are expensive, it also could be that the gasket inside the master cylinder is inverted even if it is a new master cylinder this could be the case, ive had four bad remanned ones in a row, before i got a good one... hope i could help
Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.
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Some ABS systems (if it has this) cannot be successfully bled without a pressure bleeder attached.
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