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screeching rear shimano xt disc brake on specialized epic comp

Old 02-27-07, 09:56 PM
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screeching rear shimano xt disc brake on specialized epic comp

Just got a slightly used 2006 model (demo from store).
The rear bake lever has alot of free play (more than the front), doesn't stop too well, and schreeches like, well - it's unbeleivable! Front is dead silent.

Help me please! Pad change? Best pads? Fluid?

Thanks,

Jeff
Oahu
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Old 02-27-07, 10:00 PM
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Originally Posted by jbeck696
Just got a slightly used 2006 model (demo from store).
The rear bake lever has alot of free play (more than the front), doesn't stop too well, and schreeches like, well - it's unbeleivable! Front is dead silent.

Help me please! Pad change? Best pads? Fluid?

Thanks,

Jeff
Oahu
sounds like your rotor just needs a lube job. I prefer phil's tenacious oil - you have to reapply more than grease, but I think the extra smoothness it provides makes it worth it.
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Old 02-27-07, 10:09 PM
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ew sounds nasty! i heard galfer brake pads work wonderfully on them. They should help with the squeak.
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Old 02-27-07, 10:53 PM
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lube the rotor? Are you serious? I thought keeping them clean and dry is paramount!
I have a motorcycle and if i get any oil on the rotor - no brakes at all.
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Old 02-27-07, 11:05 PM
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Originally Posted by jbeck696
lube the rotor? Are you serious? I thought keeping them clean and dry is paramount!
I have a motorcycle and if i get any oil on the rotor - no brakes at all.
just kidding! please don't put oil on your rotors - or if you do, please tape the first ride afterwards.
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Old 02-27-07, 11:07 PM
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Originally Posted by Eatadonut
just kidding! please don't put oil on your rotors - or if you do, please tape the first ride afterwards.
damn! too late...
uploading video to youtube eta 1:01
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Old 02-27-07, 11:16 PM
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Originally Posted by jbeck696
Just got a slightly used 2006 model (demo from store).
The rear bake lever has alot of free play (more than the front), doesn't stop too well, and schreeches like, well - it's unbeleivable! Front is dead silent.
Take it back into the shop you purchased it from and have them make it right. It sounds like it needs a bleed. The squealing can be handled by applying anti-sieze paste to the back side of the brake pads (i.e. between the brake pad and the piston).
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Old 02-27-07, 11:58 PM
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Probably needs a bleed and perhaps new pads. Start with the bleed and go from there. If you just got the bike the shop should do it free of charge.
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Old 02-28-07, 06:31 AM
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I agree that the shop should make this right! The XT's that came on mine were never prone to noise.
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Old 03-02-07, 01:42 PM
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well I went to take out the pads and, and, the pads and rotor were oily!!
I guess it's off to the local bike shop for a bleed, new pads, and to figure out the leak.
UNLESS: you guys have experience - where do they (caliper) normally leak ?
Well I guess some idiot could have lubed the chain (and the rotor!)
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Old 03-05-07, 02:22 PM
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Originally Posted by jbeck696
well I went to take out the pads and, and, the pads and rotor were oily!!
I guess it's off to the local bike shop for a bleed, new pads, and to figure out the leak.
UNLESS: you guys have experience - where do they (caliper) normally leak ?
Well I guess some idiot could have lubed the chain (and the rotor!)
Normally if there is a leak, it will also suck in air and your brakes will just stop working in very short order.
When this happens, the lever goes to the grip with no resistance and you run into something.
From the sounds of it, it's probably not a leak.
It sounds almost like Eatadonut's advice was taken. lol

Clean the rotors completely with a good solvent to get the oil or greese off, and then get the solvent residue with rubbing alcohol, you might be looking at new pads as they tend to hold oils in the pores of the pad materiel. (don't get the solvent on your pads either, very bad)
The fore mentioned Galfer pads are by far the best available today and the price isn't terrible either at $16.99 a pair.

From there, I like to clean my rotors when needed with a light rub down with 600 grit sand paper.
That's what Galfer suggests as well, and since I am a Galfer dealer..... You get the rest.
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Old 03-05-07, 03:06 PM
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Originally Posted by Gravity Worx
It sounds almost like Eatadonut's advice was taken. lol
That always, ALWAYS ends in tears.

You didn't, by chance, lube your chain with your bike upside-down, did you?
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