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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 08-02-13, 08:27 AM   #1
Jarrett2
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Noisy Disc Brakes?

My disc brakes have recently become very noisy when stopping. Only the last few feet of the stop, both the front and back brake let out this loud groan/squeek noise just has I come to a stop. Is there a way to stop this?
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Old 08-02-13, 10:09 AM   #2
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adjustment could be off... but I would start by cleaning the rotors with rubbing alcohol...

what brand are they?
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Old 08-02-13, 11:13 AM   #3
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Some people even "BAKE" the brake pads.

http://www.bikeforums.net/showthread...our-pads-works

Trying the adjustments first. I personally enjoy tweaking and working on my bike. Sometimes it gets overwhelming.

You can also get a spray can of Brake Kleen at any auto parts store, its pretty much what donalson is suggesting. It is brake pad specific fix stuff.
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Old 08-02-13, 11:27 AM   #4
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my BB7 mechanical road discs have always squealed and groaned like a banshee and not stopped all that well. My Shimano hydraulic disc on my MTB have been quiet and flawless.
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Old 08-02-13, 11:38 AM   #5
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Originally Posted by slowride454 View Post
my BB7 mechanical road discs have always squealed and groaned like a banshee and not stopped all that well. My Shimano hydraulic disc on my MTB have been quiet and flawless.
shiggy, a supermod on MTBR with almost 50k posts posted this link the other day (to yet another forum that he's on lol)... good info

http://www.velocipedesalon.com/forum...tml#post523038
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Old 08-02-13, 12:11 PM   #6
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First question, when was the last time the pads were replaced?

My wife's disk brakes squealed. I change the pads and they got much better. Then I sanded each side of the rotors to get them clean and roughen them up a bit.

Then, standing over top of the rotor/brake assmbly, center the rotor between the pads using the adjustment screws. There should be equal distance on both sides so when you pull the brake levers the pads contact the rotors at the same time and keep the rotor in a straign line. If they don't the rotor will flex one way or another. Err on the side of no rotor flex when adjusting even if it doesn't appear completely centered.
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Old 08-02-13, 12:30 PM   #7
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the centered thing is true if it's using hydros with 2 (or 4) opposed pistons... that is NOT the case if you are using a cable brake... on cables they are based around one piston moving and then bending the rotor over to the other pad... so the inboard (stationary) pad needs to be set as close to the rotor as you can get without drag... the bb7's made this easy to do, some other mechaincals I've used took a bit more work to get it right.
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Old 08-02-13, 07:09 PM   #8
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Quote:
Originally Posted by slowride454 View Post
my BB7 mechanical road discs have always squealed and groaned like a banshee and not stopped all that well. My Shimano hydraulic disc on my MTB have been quiet and flawless.
My BB7 Road brakes stop well and make very little noise. The only time I hear them is when I've bent the brake rotor or mis-adjusted the pads so that one is constantly dragging on the disc.
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Old 08-05-13, 08:01 AM   #9
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I ended up just using a paper towel and cleaning the rotors well and problem solved.
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Old 08-05-13, 09:36 AM   #10
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glad it was that simple for you to fix
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