Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 11-25-03, 06:25 PM   #1
merrorun
Newbie
Thread Starter
 
Join Date: Nov 2003
Location: New York, Westchester
Bikes: Bianchi Brava, Bianchi Super Grisly
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Noise from disc brakes

[FONT=Arial]I just purchased a Bianchi mountain bike with disc brakes. The first few rides were fine but then I came up with a screeching sound form the rear wheel. The bike shop says the disc brakes are acting up due to the cold weather. Has anyone had a similar experience?
merrorun is offline   Reply With Quote
Old 11-25-03, 06:35 PM   #2
gonesh9
wonderer, wanderer
 
gonesh9's Avatar
 
Join Date: Mar 2003
Location: portland, or
Bikes: surly crosscheck, yeti 575, salsa moto rapido, kona ute
Posts: 1,712
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by merrorun
Has anyone had a similar experience?
Yes. Quite annoying, eh? I haven't found really any way to completely stop them from squeaking when they really want to.
__________________
Bicycle-eye
gonesh9 is offline   Reply With Quote
Old 11-25-03, 08:10 PM   #3
Cappy
Newbie
 
Join Date: Nov 2003
Bikes:
Posts: 3
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't much about bicycle disks, but in cars, organic brake pads are less noisy at low temperatures than semi-metallic or metallic pads. Do you know what kind are used?
Cappy is offline   Reply With Quote
Old 11-25-03, 08:13 PM   #4
Jim311
Senior Member
 
Jim311's Avatar
 
Join Date: Dec 2002
Location: Gainesville, Florida
Bikes:
Posts: 1,791
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No problems with mine during semi-cold weather.
Jim311 is offline   Reply With Quote
Old 11-25-03, 09:47 PM   #5
bentrim
Guest
 
Bikes:
Posts: n/a
Mentioned: Post(s)
Tagged: Thread(s)
Quoted: Post(s)
Quote:
Originally Posted by merrorun
[FONT=Arial]I just purchased a Bianchi mountain bike with disc brakes. The first few rides were fine but then I came up with a screeching sound form the rear wheel. The bike shop says the disc brakes are acting up due to the cold weather. Has anyone had a similar experience?
Yeah, me too on the Hayes hydros. But it's my front brake on my newest bike, bought in early October which still has less than 10 hours of riding on it (hey, I've been busy!).

I guess it's still in the break-in period.

The rub was quite bad at first causing resistance against the wheel turning. As you say, it was "screeching" while I rode. Quite embarassing as other people would think, "what a piece of junk!"

The fix:

I loosened the brake on the mounts on the forks, then stuck thin cardboard on either side of the break shoes and disk, squeezed down on the brake lever, tightened the mount back on while still squeezing the brake, then let go of the brakes and removed the cardboard spacers. This re-aligned the brake pads.

It's usually silent but I still get a bit of break rub sometimes, especially if I pop a wheelie. It comes and goes intermittently. Doesn't screech anymore though. Just a metallic ringing sound the odd time (usually after my front wheel comes down after a wheelie, a bunnyhop or something to jar the bike a little), or after riding in wet conditions. Maybe I just need time to break the damn thing in.

Damn work before pleasure...

Last edited by bentrim; 11-25-03 at 11:33 PM.
  Reply With Quote
Old 11-25-03, 10:56 PM   #6
Jim311
Senior Member
 
Jim311's Avatar
 
Join Date: Dec 2002
Location: Gainesville, Florida
Bikes:
Posts: 1,791
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
If your rotor squeaks occaisionally during riding you may have warped discs. Mine squeaks intermittently because the rotors are warped. Your pads or rotors may be contaminated as well causing it to squeal.
Jim311 is offline   Reply With Quote
Old 11-26-03, 08:45 AM   #7
rasheed
mmm babaghanouj.
 
rasheed's Avatar
 
Join Date: Aug 2003
Location: toronto, canada.
Bikes: '02 gary fisher tassajara disc, '03 norco fluid 3.0
Posts: 815
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by merrorun
I just purchased a Bianchi mountain bike with disc brakes. The first few rides were fine but then I came up with a screeching sound form the rear wheel. The bike shop says the disc brakes are acting up due to the cold weather. Has anyone had a similar experience?
of the two sets of disc brakes i got, my magura julie hydros squeel the most, the front brake is perfectly fine, but the rear screams like a banshee when i apply them, especially on downhill sections.

my hayes mechs (which are newer than my maguras) squeel a bit from both the front and the rear Ė the rear more than the front, but thatís really only when i apply them lightly. they probably just need a bit of cleaning.

usually, disc brakes need a bit of time to break in, and because i generally use the front brake more than the rear, the rear takes a lot longer to break in than the front.

youíll also get a little bit of rubbing while riding here and there. itíll come and go. i think this is kind of normal. the only other ďweirdĒ sounds i get from my brakes usually come when iím riding in the rain or if iíve just gone through a puddle or something.
rasheed is offline   Reply With Quote
Old 11-26-03, 11:27 PM   #8
tFUnK
Senior Member
 
Join Date: Jun 2002
Location: Menlo Park, CA
Bikes: GT Forte Ti, Ridley XBow, Specialized Tricross Sport, Specialized Langster, Xootr Swift
Posts: 2,278
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
my avid mechs squeel in wet conditions and they are well broken in already... can't figure it out
tFUnK is offline   Reply With Quote
Old 11-27-03, 03:53 PM   #9
Mtn Mike
Super Biker
 
Mtn Mike's Avatar
 
Join Date: Nov 2002
Location: Spokane WA
Bikes: 2014 Curtlo, 2006 Serotta Coeur díAcier, 2005 Independent Fabrication Steel Delux, 2003 Surly 1x1, 2003 Surly Cross Check, 1986 Schwin Worldsport SS commuter, 1980's Mongoose Supergoose
Posts: 1,183
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My Hayes hydros squeel in all conditions. I've tried everything in the book to quiet them, without success. It really doesn't bother me that much though. :/ All I care is that they stop. Now, when my other bike's rim brakes squeel, that bothers me, because it means they aren't working very well, errrrr.
Mtn Mike is offline   Reply With Quote
Old 11-28-03, 08:47 AM   #10
dirtbikedude
Gravity Is Yer Friend
 
dirtbikedude's Avatar
 
Join Date: May 2002
Location: "Over the Hill" and going down fast in the 805.
Bikes: Scott Gambler, Scott Ransom, Kona Bear, Bianchi 928 Carbon/Chorus, C'Dale Rize4
Posts: 2,961
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A few things you could try, as mentioned check the discs to see if they are warped, clean them to be sure they are not contaminated and chage the pads.
You might have sintered or pads with more metal in them, try some organic pads.
Also, remove any paint between the mounts on the frame and the calipers. Be sure that the disc is running stright and the caliper is centered on it.

Some brakes will also squeel more when they heat up. If you are riding the brakes alot that could also be your problem.

Lastly, some brakes will always squeel and you will have to get used to it.

dirtbikedude is offline   Reply With Quote
Old 12-01-03, 05:47 PM   #11
crashing_sux
Monkey
 
crashing_sux's Avatar
 
Join Date: Nov 2003
Location: Whistler, BC
Bikes: Specialized Enduro
Posts: 97
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Plenty of good suggestions, here's my cheap and quick fix. Swap the front and rear pads. Sometimes the pads and rotors wear into a particular pattern that causes squealing and just swapping the front and rear pads takes the pads and rotors out of the squeal inducing alignment they were in.

It only works about half the time in my experience but it's free and only takes five minutes so why not give it a shot?
crashing_sux is offline   Reply With Quote
Old 12-02-03, 03:41 AM   #12
tFUnK
Senior Member
 
Join Date: Jun 2002
Location: Menlo Park, CA
Bikes: GT Forte Ti, Ridley XBow, Specialized Tricross Sport, Specialized Langster, Xootr Swift
Posts: 2,278
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Quote:
Originally Posted by crashing_sux
Plenty of good suggestions, here's my cheap and quick fix. Swap the front and rear pads. Sometimes the pads and rotors wear into a particular pattern that causes squealing and just swapping the front and rear pads takes the pads and rotors out of the squeal inducing alignment they were in.

It only works about half the time in my experience but it's free and only takes five minutes so why not give it a shot?

good way to get more life out of the pads
tFUnK is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:31 PM.