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Old 09-13-05, 09:21 PM   #1
neopipil
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Squeaky Disc Brakes

I apologize for the repetition but I really want a solution to this problem

My bikes came with Hayes HMX-1 mechanical disc brakes. They started squeaking about a month after I bought the bike and I have tried just about everything to get the squeaking to stop but nothing has worked.

I have cleaned the rotor with alcohol. I have cleaned and sanded the pads. I have adjusted the brakes and nothing has worked.

Are these brakes so crappy that the problem will never stop? Will new pads fix the problem? Any suggestions are appreciated.

It is really annoying having squeaky brakes.
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Old 09-13-05, 10:08 PM   #2
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My HMX-1 is slightly squeaky from time to time... my guess is your pads may be contaminated though. Do you use a spray on lube? I've found this to be a big no-no on disc brake equipped bikes. You don't realize how much of that stuff doesn't go on your chain!
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Old 09-13-05, 11:23 PM   #3
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Quote:
Originally Posted by neopipil
I apologize for the repetition but I really want a solution to this problem

My bikes came with Hayes HMX-1 mechanical disc brakes. They started squeaking about a month after I bought the bike and I have tried just about everything to get the squeaking to stop but nothing has worked.

I have cleaned the rotor with alcohol. I have cleaned and sanded the pads. I have adjusted the brakes and nothing has worked.

Are these brakes so crappy that the problem will never stop? Will new pads fix the problem? Any suggestions are appreciated.

It is really annoying having squeaky brakes.
My Avids had numerous problems, I put new cables on and made them ridiculously straight, no slop.
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Old 09-14-05, 05:48 AM   #4
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I don't know how the pads are arranged, but the squeal is usually caused by the movement of the pads. You could try putting motorbike anti-squeal compound behind the pads (not on the rotor-facing side of course).


I love my squeak. Doesn't bother me in solitary riding... lets me know the brakes are working and for commutes, is a great (all right, somewhat aggressive) substitute for a bell
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Old 09-14-05, 04:01 PM   #5
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Originally Posted by 2old2befast
You could try putting motorbike anti-squeal compound behind the pads (not on the rotor-facing side of course).
No No A thousand times NO.
Products such as Copaslip or copper grease are inadvisable due to contamination risks. Bicycle rotors don't generate enough heat to burn off these materials.
For example: A heavily applied bike disc can excede 450 deg F. Trail riders doing anything more than cruising can reach 350+ without any trouble.
However, a family car's brakes can hit up to about 600 degrees CELSIUS which is 1,112 degrees farenheit. Sports cars get even hotter so please no car products on bike parts.
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Old 09-16-05, 02:08 AM   #6
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neopipil: checked your profile,this prob is on an Iguana,right? Hate to tell you,but it's pretty much nature of the beast. I've got the same thing on my Sedona(same brakes,and basically a comfort version of your bike) and my father's Cypress does it too. They're just lower-end discs. Mine only squeal when I put them on hard,so I've just gotten used to it.
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Old 03-16-06, 04:45 AM   #7
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Just a note regarding anti-squeal compound as used on motorcycle (and car) disc brakes.

Brake squeal is caused by high frequency vibration of the pad when applied. A little grease may damp that down but the risk is that when heated normal grease will exude oil (it is designed to do that) and lubricarte the disc itself - a bad idea!


Copper greases are not anti-squeal greases. Copaslip and the other copper greases are anti-seize products for where heat will ldry away normal grease. E.G. exhaust bolts. The only use of Copaslip on motor-vehicle disk brakes is traces on sliding metal parts as the intense heat will dry out ordinary grease. Bicycle discs are never ever working that hard so I would not advise it!


Anti-squeal compound (also called "rubber grease") is a stiff and rubbery grease you apply to the rear of the brake pad where it contacts the operating piston. Usually it damps out the vibration enough to get rid of audible squeal. But some brakes do just squeak and it is hard to control

IMHO there is ablsoutely no reason not to use anti-squeal compound on bicycle disc components.
You can get it from most good bike or car parts shops in very expensive 500ml tubs or little sachets at about 60pence in UK


Jon
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Old 03-16-06, 07:58 AM   #8
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I had hayes on a bike I bought. They squeaked from day 2. I adjusted, I cleaned. I cleaned, I adjusted. Finally I got so fed up that I traded them out for a pair of vbrakes. Much easier to adjust and the difference in braking power just isn't worth the pain.
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Old 03-16-06, 12:12 PM   #9
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Sure - all the bad news just when I'm considering buying a bike with the Hayes MX2 setup. (Kona Dew Deluxe if anyone cares).
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Old 03-16-06, 12:16 PM   #10
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except for initial break in, I don't have problems with my Avids. Occassional a small squeal that disappears after apply the brakes and won't show up again for months. Like some foreign substance gets on the brakes for a bit. I'd suggest checking with LBS and see if they have a solution or repost in the mechanics section.
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Old 03-16-06, 01:07 PM   #11
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I just crank my ipod louder
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Old 03-16-06, 01:26 PM   #12
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Squeaking and Squealling may be caused by loose components. IS there any lateral play in the discs? How about the cones/hubs? Even a barely-perceptible amount of motion may be enough to cause vibration. Any binding in the calipers? The cables?

Disc brakes will squeal more because 1) the angular velocity of a disc rotor is much greater than that of a rim (so the ratio of rotational speed to the displacement of a loose part will be greater (of higher frequency) and 2) because soft rubber rim brake pads do a lot to dampen high frequency noises.

Consider these, and good luck with your diagnosis,

A.
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Old 03-16-06, 02:28 PM   #13
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Quote:
Originally Posted by 1ply
Sure - all the bad news just when I'm considering buying a bike with the Hayes MX2 setup. (Kona Dew Deluxe if anyone cares).
Saw that on the website. Odd,mine('05) has Shimanos(and Slickasaurus tires).

My Giant only squeaks now when the discs are dirty from riding in the rain. The original pads wore funny. Dews are sweet bikes and I wouldn't let a little thing like brake noise dissuade you from getting one. On the plus side,the Hayes are very simple to adjust and the pads are rediculasly easy to change.
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Old 03-16-06, 06:56 PM   #14
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I have the those breaks too. Mine squeeked when I wore the pad out, and I put a new one in and that fixed it. I can't imagine your pad would be worn out after a month though, it took me over one year of fairly heavy riding.
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