Well I took the caliper off the back brake and unknownly hit the lever. Thus expanding the pistons from the bore. So now it needs to be taken apart and reseated. My quesiton is. If I take the caliper apart, how do I stop the hydro fluid from leaking?
Hayes HFX-9 6"Hydraulic disc problem..
- Thread starter Mitch
- Start date
You don't.
If you're taking a caliper apart, you should know how to bleed them. Hayes brakes are about the easiest bleed out there. Make absolutely sure you can't push the pistons back in before you go dissassembling the caliper body though (not that it's a big deal if you have to).
While you're in there, go ahead and replace the o-ring looking seals behind the pistons. If they are more thatn a few months old, the new ones will make your brakes feel brand new.
So if I have to take the caliper apart you have to bleed the lines? balls. Geuss i'll take it to the bike shop for this one. Have no idea how to bleed and "re-enter" the fluid 
I've done the same thing many times . Just put an open end wrench in there and push the pistons back in. Once you can fit the closed end of the wrench in use that flush against the piston to get them both all the way in again. The thing to watch for is to not damage the pins which hold the pad in place, and to push the piston in evenly.
Deleted stupid post. I read the manual front to back...
Take Oldfart's method one step further. When the wheel is back in the bike, slide a credit card (or something similar) in between one of the pads and the rotor. Squeeze the lever a few times and remove the card. Then squeeze the lever a few more time to reset everything.
And depending how far the pistons came out, do your best to push them back in straight.
YOU DONT NEED TO TAKE IT APART!!!!
Take a screwdriver and push the pistons back into the caliper (The caliper is what holds the pistons. The rotor goes in)
Take a screwdriver and push the pistons back into the caliper (The caliper is what holds the pistons. The rotor goes in)
Yah after reading this and the manual I figured you dont have to take it apart. dammit....... from now on before I take anything apart i'm reading the manual/asking in here!