Today i was driving and when i came to the stop my brakes worked , but i noticed that they were depressing by them self i had to put it in nutral and use e brake ?


whats going on

 

So you're saying you stopped and the pedal slowly sunk down to the floor? Or the pedal went straight to the floor real fast? Have you checked the fluid level to see if it's still full or not? Need a few more details....

 

the fluid is right to the top , and it slowly lets out i have to pump it to get it to hold but it goes forward when i let go and put it back in ...

 

brake master cylinder?

 

Ahh...that's better. Your master cylinder piston seal is leaking internally, thus not allowing it to hold pressure. You need to either rebuild it or replace it (I recommend just replacing it, they're not that expensive). Did you by chance just flush the brake fluid not long ago after not flushing it for a long time? Either way, when you put a new MC in I'd recommend flushing the system anyways to start with all clean fluid.

 

im not familiar with flushing / to avoid screwing it up i never did but ..lesson learned.. that makes more sence ... i couldnt find any leaks on the resevor


Could that be why i cannot get the freeking back hubs off..?

 

Flushing is a good thing, but it needs to be done regularly. It's just like tranny fluid (auto), p/s fluid, etc. It needs to be changed on a regular basis "before" it gets dirty and nasty. Once it gets real dirty and contaminated, the particles start to wear little etches and scratches in the metal piston surfaces and seals. As long as this dirt and crap is still in there, it's actually helping to seal these imperfections. Then when you flush it out and put all clean fluid in, there's no longer any dirt to help plug those spots, so the clean fluid just seeps right through cuz it can't seal. That's why they say if you haven't changed your tranny fluid for a long long time, you're better off NOT flushing it, cuz more than likely soon after you flush it the tranny will go out. Exact same goes for the brake system (master cylinder mostly) and power steering system. Keep the fluids clean at all times, and this virtually never becomes an issue.

As for your rear hubs.... do you have drums or discs in the back? Drums like to stick on cuz the brake shoe friction surface against the drum doesn't go all the way to the edge of the drum, so there's a little metal ridge going all around the outside edge (the shoes wear the inner part of the drum). These ridges also like to rust alot since they're never getting rubbed against by the shoes. If you can get to the self adjusters you can sometimes adjust the shoes in a bit and that makes it alot easier getting it off. Otherwise, get a couple of screwdrivers, a hammer, and a pair of gloves and go to town with it. You have to kinda work it out a little then try and turn the drum while pulling out on it. Drums suck, I hate drum brakes

 

Mine has the same problem, but only when I use the A/C or shortly thereafter. I've mentioned this before, but never got a decent answer - and I haven't gotten down and figure it out myself. It seems vacuum related.

If you find an answer, please share

 

check the vaccum hose or for leaks .....if ur not losing fluid most likley your master cylinder