Sutck disc brake piston and no bike shop to fix it
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Sutck disc brake piston and no bike shop to fix it
Postby willsmother » Sun Apr 07, 2013 11:05 pm
Apologies for posting this in two places, I put it on the MTB forum first then realised this board was for technical issues
Thankyou
Helen
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Re: Stuck disc brake piston and no bike shop to fix it
Postby Nobody » Sun Apr 07, 2013 11:08 pm
Another option to repair would be to order an Avid BB7 or similar cable disc brake, some V brake levers and MTB brake cable. That way you could convert the rear to cable disc and not have to worry about the hydro fix until you get back to AU. If you are there long term, then covert both brakes to cable disc to make servicing and repairs easier.
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Re: Stuck disc brake piston and no bike shop to fix it
Postby trailgumby » Sun Apr 07, 2013 11:33 pm
Fixing it requires patience, a pack of cotton bud ear cleaners, and brake cleaner spray.
Basically it was a case of easing out the brake piston as far as you can without popping it out, one side at a time, and using the cotton bud and brake cleaner spray to clean the grunge off the piston wall all the way around. First one piston, ease back in, do the other. The idea is to unstick each side enough so they retract evenly. I use tyre levers to hold one side in place while easing the other out, and to push back into place to test the action.
If one side retracts better than the other, eventually one brake pad will move out and drag on your rotor and you get that really irritating "ee-ee" noise each wheel revolution. And of course your brake pad wears out prematurely.
Needless to say, take care not to get any brake fluid on our pads if you do make a slip and pop out a piston a little far. In which case a brake bleed is also required before using our brakes again.
I'd also suggest brake fluid replacement, as a lot of crud does get past teh piston seal and can affect teh action too.
Hope this helps.
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Re: Sutck disc brake piston and no bike shop to fix it
Postby jackthelad » Mon Apr 08, 2013 1:15 am
heres the link u need
print out manual u need
good luck
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Re: Sutck disc brake piston and no bike shop to fix it
Postby RonK » Mon Apr 08, 2013 6:56 am
Helen, what you are describing sounds like fairly normal operation for a single-piston floating caliper brake.willsmother wrote: When I look at the rotor, one side (the inside side closest to the wheel) doesnt seem to want to move like the outside one does. So the rotor moves a little bit each time.
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Re: Sutck disc brake piston and no bike shop to fix it
Postby MattyK » Mon Apr 08, 2013 9:41 am
Which would be great if the M485 wasn't a twin piston caliper...RonK wrote: Helen, what you are describing sounds like fairly normal operation for a single-piston floating caliper brake.
http://techdocs.shimano.com/media/techd ... 648520.pdf" onclick="window.open(this.href);return false;
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Re: Sutck disc brake piston and no bike shop to fix it
Postby jules21 » Mon Apr 08, 2013 12:57 pm
once you've got the piston in the position you want it, remove the rear wheel to get better access to the piston and clean it with whatever you can get. give the whole area around it a good clean. do not get anything on the pads - or they may become contaminated and useless (some substances are worse than others - to be safe, ensure you have removed the pads before cleaning the piston(s)).
if there is gunk in there, it may have been the cause of the piston binding and your problems may be solved by cleaning. I can't guarantee that - a worn piston seal could be another cause and you won't solve that by cleaning - you'd need to rebuild the caliper, which is not an option from what you're saying.
good luck.
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Re: Sutck disc brake piston and no bike shop to fix it
Postby willsmother » Mon Apr 08, 2013 10:08 pm
How hard is it to put them on?? Would they fit on my existing rotors?
On my existing mounts?
Many thanks to all
Helen
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Re: Sutck disc brake piston and no bike shop to fix it
Postby Nobody » Mon Apr 08, 2013 10:17 pm
If you can put standard rim brakes on, then you can do cable discs too.willsmother wrote:I like the idea of putting cable brakes on but not the thought of actually doing it....
How hard is it to put them on?? Would they fit on my existing rotors?
On my existing mounts?
Many thanks to all
Helen
BB7s come with a number of standard brackets from memory. They should fit your standard mounts and if you buy a brake for the same size rotor, then the rotor should fit too. Often you get the brake with a rotor anyway, so better to use the one it comes with.
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Re: Sutck disc brake piston and no bike shop to fix it
Postby willsmother » Mon May 06, 2013 1:36 am
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Re: Sutck disc brake piston and no bike shop to fix it
Postby nico3d » Tue May 07, 2013 12:58 am
Any help will do!
thanks!
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Re: Sutck disc brake piston and no bike shop to fix it
Postby nico3d » Tue May 07, 2013 1:06 am
I just joined in search for some help and for what i've read it seems you know Dili or even live there. I'm on the way there to get a second indonesian visa and I'm completely frustrated because both of my rims are completely cracked and in Indonesia it seems to be impossible to find rims that have 36 holes, everybody uses 32 here because everybody is on disc brakes, I'm not.
So, do you have any idea where in Dili I should be able to get a pair of rims? At least what stores I could visit? Even if they are cheap chinese ones that will get me somewhere should suffice for now.
Thanks for any help you can provide!
nico
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Re: Sutck disc brake piston and no bike shop to fix it
Postby willsmother » Tue May 07, 2013 10:06 pm
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Re: Sutck disc brake piston and no bike shop to fix it
Postby willsmother » Tue May 07, 2013 10:07 pm
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