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Brakes Stuck On! Confused

 
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TJ



Joined: 22 May 2008
Posts: 1195
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Location: Devon/Cornwall UK

PostPosted: Tue Jan 20, 2009 10:19 am    Post subject: Brakes Stuck On! :? Reply with quote

Hey guys.

This morning I was riding to 6th form and about halfway that the bike suddenly started feeling odd, making heavy weather getting up the hills and was lacking it's usual pep.

I pulled over to have a look over and my rear caliper was smoking. The rear brake pedal is very hard to push down, but it feels spongey at the same time.

Once the caliper had stopped smoking, I had a look inside and the pads were pressed fairly hard into either side of the disc. The pads were changed a few hundred miles ago, and I haven't had any problems up to now.

I managed to push the pads back into the calipers a tiny bit with a screwdriver, and managed to crawl the rest of the trip at about 30, but if I so much as touch the rear brake they lock themselves to the disc again.

Any ideas what could be wrong or how to stop it?

The bike (as I'm sure you'll know) is an 07 yamaha xt125x, and the rear brakes are hydraulic disc ones.

I'd kinda like to get them off properly before I make the trip home, but I only have the contents of the bike's toolkit, and some basic tools from the design department at a push.

Cheers! Wink Confused



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craigthomas1990



Joined: 21 Sep 2007
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Location: taunton zummerset

PostPosted: Tue Jan 20, 2009 1:40 pm    Post subject: Reply with quote

I had this problem before tj my fix was on the rear brake peddle there should be a bolt which pushes the peddle so far down to that it levels out the pedle so its comfortable.
my guess is that the bolt has vibrated loose and screwed its self down some more which is causing the peddle to push the pad which engages them to the disk. all you need to do if it is this is inloosen the bolt and put some thread lock on it.

let me know how it goes . craig



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TJ



Joined: 22 May 2008
Posts: 1195
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Location: Devon/Cornwall UK

PostPosted: Tue Jan 20, 2009 6:03 pm    Post subject: Reply with quote

thanks for the reply Smile
I kept going back to it in spare moments during 6th form, and pumping the pedal, and they seem to have unstuck themselves, and so far they haven't jammed again. Smile

I suspect there was just some grit stuck behing the pads or something... I'll have the whole lot apart this weekend.

So... we'll see how it goes... Confused



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WilliamHung



Joined: 03 Nov 2006
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Location: Da City (DC), USA Yeah that's what DC stands for don't you know?

PostPosted: Tue Jan 20, 2009 7:30 pm    Post subject: Reply with quote

Hey TJ, when you get a chance, you may also want to try the following:

1. take the pads off of the caliper using a c-clamp,
2. compress the piston back all the way,
3. take c-clamp off, squeeze brake lever again.
4. repeat steps 1-3 a few times to see if you have a smooth and free movement of the piston on the brake caliper.

Check/change your brake fluid while you are at it. If you don't have free movement of the caliper, either take_apart/clean/reassemble or rebuild or replace caliper as necessary.

YMMV



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mightbesane



Joined: 05 Sep 2008
Posts: 4020
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Location: Pennsylvania, USA/Languedoc, France

PostPosted: Tue Jan 20, 2009 7:33 pm    Post subject: Reply with quote

TJ wrote:
I suspect there was just some grit stuck behing the pads or something... I'll have the whole lot apart this weekend.


That gets my vote.



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