Rear brakes have become innefective

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Rear brakes have become innefective

Postby ozstriker » Tue Sep 25, 2012 6:48 pm

I am running an ultegra group set with 1100 k's on it and I have recently done a few long fast decents, and my rear brake has become almost completely useless.

Could I have glazed the pad, I have checked the rim and haven't noticed any oily residue on it, and my front brakes are still working relatively well?

Thoughts?
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by BNA » Tue Sep 25, 2012 7:21 pm

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Re: Rear brakes have become innefective

Postby Reman » Tue Sep 25, 2012 7:21 pm

Try cleaning the rims with acetone or metho, I've found that helps remove any oily residue (especially what you can't feel).

Otherwise maybe dial out the levers so you get more leverage, or your brake cables have stretched and need to be reseated or replaced.
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Re: Rear brakes have become innefective

Postby R12RT » Tue Sep 25, 2012 7:49 pm

You could try lightly sanding the pads.

I've had success with this in the past to improve brake performance.
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Re: Rear brakes have become innefective

Postby open roader » Tue Sep 25, 2012 8:21 pm

R12RT wrote:You could try lightly sanding the pads.

I've had success with this in the past to improve brake performance.


+1

Sand them face down on some very fine emery paper and make sure the emery paper is dead flat to ensure an even cleaning. I'd also clean the brake track with metho or acetone.
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Re: Rear brakes have become innefective

Postby Stepr » Tue Sep 25, 2012 8:34 pm

yeah reface the brake pads on a smooth file, and give the rims a going over with metho and 0000 (4 zero) steel wool lightly
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Re: Rear brakes have become innefective

Postby jacks1071 » Tue Sep 25, 2012 10:24 pm

R12RT wrote:You could try lightly sanding the pads.

I've had success with this in the past to improve brake performance.


A metal file is best for this - you can do it in the bike and it doesn't take much to take the glaze off.

I'd also wipe down the rims with metho or similar incase you've got oil or grease on them.
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Re: Rear brakes have become innefective

Postby jules21 » Wed Sep 26, 2012 1:35 pm

check that the pads are mating properly with the rim surface. as pads become worn, the caliper arc gets longer and this can result in the pads making contact with the rim lower down. if the bottom of the pad clears the rim braking surface, you'll get uneven pad wear and reduced braking performance.
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