major brake problem By tommyhasascooter (Read 643 times)

[tommyhasascooter]

Crap! I might be in a bad situation.
I was changing the brake fluid with a friend of mine when I accidentally let a little air get into the reservoir.
we continued to bleed it figuring we would just force the air out the bottom.
But now I cant get any pressure to build up.We went through at least 7 fill ups trying to run the air out of the line.

My friend says it seems like the master cylinder went bad. At first It seemed weird that it would happen the same time I let air into it but I am really not sure whats going on.

here's some more facts..
1:while pumping there was a few times nothing came out and other time the fluid came out fine.

2:also a few days ago, after I changed the pads I noticed the same brake pressure left then came back 2 times that day but has been fine since.


Does this sound like air or something more serious?

[tommyhasascooter]

one other thing this may or may not be relevant, during the bleeding when ever I pumped it would shoot fluid up and out of the reservoir . I had to keep the lid on or squeeze real slowly

[tommyhasascooter]

ITS! FIXED!!![glow=red,2,300][/glow]

That's funny, no one has responded yet which in a way is good because, I think I fixed it
here's what I did.

Since I couldn't reach the rear break lever and loosen the valve by myself..(my arms are too short) (and the guy that helped me yesterday was not available)
I used my little noodle(head) and took the whole darn thing off and ran the brake and tubing underneath to the other side where I could easily reach them both at the same time.
I made sure the entire break line was evenly smooth and went uphill without any of the bends and dips that were there to begin with.
This way the air wouldn't get stuck at the top of one the many dips.
Then I rotated from bleeding from the top then bleeding from the bottom.
WOW there was a lot of air in the hose. I really screwed the pooch on that one.(next time I will be more careful.)
eventually (almost a whole bottle of fluid) It got some pressure and it works now.

the only thing left is the pads still make a clicking noise when i use them medium or hard.

and the dam fluid ate through my plastic and now is crumbling apart along with some nasty bleach marks ..arrrgg!

[Bashan]

Wow, that's one for the books Tommy, we'll have to remember that clever trick. I had been trying to answer you all day but it was one thing after another at work. I just couldn't think of anything else but some air trapped in the line. I read somewhere you can get a cohesive bubble trapped in the line and the fluid runs around it; I'm not sure if that's true or not but it would explain your experience. My calipers click all the time and always have. If you grab them when the brake isn't applied they will move a little and make a clicking noise. They're supposed to "float" on the rotor until applied, so they're not immovable. I'm not sure you have a problem there, I'd just make sure all the bolts are tight and go on. Maybe somebody else has other thoughts on this? Rich