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disk brake howl
Last Post 06/28/2013 07:06 PM by carl x. 17 Replies.
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THE SKINNY

Posts:380

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05/13/2013 08:47 AM
i had to get my suspension fork rebuilt so i threw on a rigid fork. the front brake howled like a banshee. i sanded down the pads and disk which helped for about 30 minutes then it started again. it didn't make any noise on the other fork. thoughts?
How we spend our days is, of course, how we spend our lives.
Inferno7

Posts:235

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05/13/2013 09:40 AM
Could be an alignment issue. Loosen brake a bit until it can freely move. Apply brake, while holding the brake lever tighten hardware. Worth a try.
Bodynazi

Posts:51

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05/13/2013 01:43 PM
I've had good luck with spraying an evaporative (made up word) cleaner into the disc pads whenst dealing with howling brakes for a fix. Either that or check the alignment although with disc pads -hoever that's a bit subjective for sure: loosen the caliper up, 'pretend' to realign, re-tighten and pray for the best.
jmdirt

Posts:683

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05/13/2013 03:01 PM
Most of the time howling is the result of vibration cause by pads that contact the disk too flat.

-Loosen the mounting bolts
-Put a piece of paper between one pad and the rotor but so it only cover the top 1/4 of the pad (for front brake...rear 1/4 for rear brake because the orientation of the caliper is different most of the time...verticle/horizontal)
-Grab a hand-full of lever and pull hard
-Tighten the mounting bolts

Howling can also be caused by a mount that distorts allowing the pads to contact the disk too flat.

The reason that sanding it worked for a few minutes is because you ever so slightly made the pads not contact the disc too flat. A friend of mine who prefers the power of flat pad contact files a taper off 1/8 of his pads on his DH rigs.
Oldfart

Posts:458

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05/13/2013 03:40 PM
Are they an Avid product ? Avid has a reputation as a howling brake. Centralizing is one key thing to do to stop howling. Some frames or forks just do it. Sometimes a different rotor will help as in a different shape. The wife's giant has a howling rear brake. I changed the clean sweep to a roundagon and it helped but did not eliminate it. Organic pads stopped it, but they don't grip all that well.
THE SKINNY

Posts:380

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05/13/2013 03:58 PM
i had the same problem with some avids but these are magura. i always thought it was from a glaze forming on the pads and disk that caused everything to oscillate hence the sanding. i'll adjust them this evening to see how that works. my other fork is supposed to be done tomorrow and i hope i don't have a howling problem with it.
How we spend our days is, of course, how we spend our lives.
THE SKINNY

Posts:380

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05/16/2013 02:17 PM
i adjusted the brake caliper and used loctite on the bolts. a also used some anti-squeal stuff that's used on car brake pads. still squeals. during my ride yesterday i wiped the sweat and grease off my brow and smeared it on the disk. that stopped it for a few minutes. i'm gonna rub some bacon on it today.
How we spend our days is, of course, how we spend our lives.
jmdirt

Posts:683

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05/17/2013 11:04 AM
Skinny,

Thread locker won't help your issue. Did you put your suspension fork back on? If so, did that cure your problem?
THE SKINNY

Posts:380

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05/17/2013 11:38 AM
i get the fork back today. i didn't figure the thread lock stuff would cure the problem but i thought it might help dampen it some. the sucky part is it squeals in the sweet spot that i brake at. just a light feathering to control speed is exactly where it squeals. i thought some of the thread lock and brake pad anti squeal stuff would shift that spot.
How we spend our days is, of course, how we spend our lives.
jmdirt

Posts:683

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05/17/2013 12:16 PM
When you put the boinger back on try my suggestion from above and see if it works (it always does for me).
jpouchet

Posts:81

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05/21/2013 01:18 AM
Disk? You have disk brakes? I sriously need an upgrade in the MTB department!

Our tandem (road) had similar problems. Used above recommendations for re-aligning pads/calipers and solved most issues. Well new pads helped too. However the rear does let out some noice now and then. When my wife says anything about it I just start pushing us faster and the brake noise goes away. That's my theory because she doesn't say anything anymore.
THE SKINNY

Posts:380

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05/21/2013 08:49 AM
i put the fork on and rode for about 100 feet with no brake noise. the fork malfunctioned shortly thereafter so no real test yet.
How we spend our days is, of course, how we spend our lives.
Gonzo Cyclist

Posts:200

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05/26/2013 10:09 AM
magura's are self centering, meaning that both pads retract, I would pull the pads, spray some brake cleaner on the caliper, sand the pads down once again, and then rub down the rotor with some rubbing alcohol. See how this works, I had a little training seminar with the Magura tech a few weeks back, and a good buddy who lives here in Santa Fe is the national sales mgr. for Magura, so we are very familiar with these brakes.
Try the above, and maybe even get a fresh set of pads in there. Be careful with the oil & grease thing, these can contaminate the pads, making them slippery, and sometimes this makes the squeeling even worse because they can glaze over much faster. Which Magura's are they? MT8's?
THE SKINNY

Posts:380

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05/26/2013 03:10 PM
rode today and no brake howl. must just be a rigid fork thing. i'm not sure what model they are. i needed some brakes in a bad way so i got an older model off of ebay.
How we spend our days is, of course, how we spend our lives.
jmdirt

Posts:683

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06/28/2013 11:51 AM
Hey skinny, did you ever get the fork fixed correctly?
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