Friday i changed the hub assembly on the front passenger side of my truck and when i put everything back together i had no brakes. i did nothing with the brakes when i did the hub. i took the caliper off and hung it up out of the way and put it back on when i was done. I've tried bleeding the brakes for hours, changed the master cylinder. Tried cracking open the lines at the master cylinder to see if there was air there. i pulled the vacuum line off the booster and you could hear the air, so i don't think that is bad. I have all fluid coming out of everywhere you could bleed the lines from and still no brakes. (I did bench bleed the master cylinder before putting it in). With the truck off you get a stiff pedal when trying to bleed, but once its started it goes straight to the floor.

 

you might have a pinhole leak in a line,
mine did that, just happend to leak after i changed my rotors/pads.
ended up completely blowing the line (rear) while tryin to bleed them

 

with a pin hole you would see fluid leaking. and you wouldn't be able to stand on the brakes with the truck off and the pedal stay in one position. Could it be the proportionary valve?

 

hmm, could be,
with my pin hole i didnt see a leak for 3 days, and i could stop, and hold it
i thought it was a valve at first, until i blew it officially.
IDK if/how you could check it before you go buy a new part

 

i can't stop. at all. i just called the dealer for prices and that valve is a little over 100. but the guy i talked to said it could be the booster even though when i pull the vacuum line off with the truck off you can hear the air come out of it. Could it still be the booster? Wouldn't i still have some kind of brakes even if that was bad?

 

i went to the junkyard today and picked up a booster, put it in and still have nothing. the only left i can think of is the proportionary valve. If thats not it what else could it be?

 

fix it yet? bump

 

no, i went and got the proportionary valve from the dealer and 120 bucks later still no brakes. It took ten minutes to change and hours of bleeding i would say there is no air in the lines and i still have nothing. So, new wheel cylinders, new brake booster, new proportionary valve, no leaks, and still no brakes. Everyone i talk to is stumped on the issue, i was hoping you guys would be able to help.

 

that sucks
IDK what else there is to replace.
it must be something so flippin simple

 

i wish it was. I mean i really don't know what else to check. No leaks ANYWHERE, all fluid coming out of the bleeder valves. I don't know what else to do. i can't even drive it to have someone look at it. and even if i could i don't think they'd find the problem.