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bjammin · 10-21-2007, 01:50 PM

Hey guys, I have a customer with XtrM965 brakes and he is complaining that they constantly squeal after about 20-30min. of riding. I have de glazed the pads, scuffed and cleaned the rotors with alchohol, as well as re-bled them.
What am I doing wrong or forgetting to do?
Thanks STR!

thephat · 10-21-2007, 02:25 PM

We have occasionaly seen 965 brakes with one piston that moves a lot more than the other no matter what you do. This can be a waranty scenario.

The rider may just be overheating the brakes. If this is the case, it a matter of braking lessons and or a bigger rotor set.

There may be pad contamination. If contaminants soak into the pads, they will squeel till replaced. Organic pads squeel less than metalic.

biglimey · 10-26-2007, 08:01 PM

Just a thought, when the original M965's came out there was an issue where the pistons would either over extend or move at an angle. The problem was cause by the piston/quad seal interface was polished. They changed to a rougher surface to allow the seal to grip the piston (and help it retract)

That typically causes the issues that thephat mentions with the pistons. If the other issues like overheating/contamination are ruled out, I'd talk to Shimano and see what they can do and maybe have them replace the pistons/caliper.

foofighter · 10-26-2007, 08:19 PM

well i have some old xt brakes and i found that when i first started riding i would ride the brakes quite often resulting in overheating the pads and rotors to the point where they started to howl. I've learned to brake more effectively and now i dont run into that till after 3-4 rides.

bjammin · 10-27-2007, 10:11 PM

Update: tossed out the metal pads for resin. Problem solved.

foofighter · 10-27-2007, 10:12 PM

great to hear! I may do that as well...

Pain Freak · 10-28-2007, 06:59 AM

Just seen the 08 xt brakes today, very sexy. The LBS said they work even better then they look.

Great more bike stuff lust!

biglimey · 10-28-2007, 09:39 AM

Quote:

Originally Posted by Pain Freak

Great more bike stuff lust!

I know what you mean! The new XTR is pretty saucy. My problem is that I have XTR taste with a Deore budget!!!

HELLDOG · 10-29-2007, 03:57 PM

Quote:

Originally Posted by bjammin

Update: tossed out the metal pads for resin. Problem solved.

Try mixing it up. use one resin, and one metalic per brake. Stops a lot better than straight resin with no noise. Got the tip from Shimano. It works!!

10-21-2007, 01:50 PM	#1 (permalink)
bjammin STR Veteran	Squealing XTR brakes??? Hey guys, I have a customer with XtrM965 brakes and he is complaining that they constantly squeal after about 20-30min. of riding. I have de glazed the pads, scuffed and cleaned the rotors with alchohol, as well as re-bled them. What am I doing wrong or forgetting to do? Thanks STR!

10-21-2007, 02:25 PM	#2 (permalink)
thephat STR Veteran	Are the pistons moving evenly? We have occasionaly seen 965 brakes with one piston that moves a lot more than the other no matter what you do. This can be a waranty scenario. The rider may just be overheating the brakes. If this is the case, it a matter of braking lessons and or a bigger rotor set. There may be pad contamination. If contaminants soak into the pads, they will squeel till replaced. Organic pads squeel less than metalic.

10-26-2007, 08:19 PM	#4 (permalink)
foofighter On the Mend	well i have some old xt brakes and i found that when i first started riding i would ride the brakes quite often resulting in overheating the pads and rotors to the point where they started to howl. I've learned to brake more effectively and now i dont run into that till after 3-4 rides. __________________ Pho'd Up: " Heart Rate Monitor + Road miles = fast. Chasing Neil, and Chris (Sar Boats) = Faster." www.coverageispersonal.com

10-27-2007, 10:12 PM	#6 (permalink)
foofighter On the Mend	great to hear! I may do that as well... __________________ Pho'd Up: " Heart Rate Monitor + Road miles = fast. Chasing Neil, and Chris (Sar Boats) = Faster." www.coverageispersonal.com

10-28-2007, 06:59 AM	#7 (permalink)
Pain Freak Charlie bit me	Just seen the 08 xt brakes today, very sexy. The LBS said they work even better then they look. Great more bike stuff lust! __________________ If quizzes are quizzical, what are tests? “Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body—but rather a skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, ‘Wow, what a ride!’ ” —anon.

10-26-2007, 08:01 PM	#3 (permalink)
biglimey Bike Industry Slave	Just a thought, when the original M965's came out there was an issue where the pistons would either over extend or move at an angle. The problem was cause by the piston/quad seal interface was polished. They changed to a rougher surface to allow the seal to grip the piston (and help it retract) That typically causes the issues that thephat mentions with the pistons. If the other issues like overheating/contamination are ruled out, I'd talk to Shimano and see what they can do and maybe have them replace the pistons/caliper.

10-27-2007, 10:11 PM	#5 (permalink)
bjammin STR Veteran	Update: tossed out the metal pads for resin. Problem solved.

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