Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Disc Brakes squeal

Old 06-22-05, 02:15 PM
  #1  
TotalKos
Senior Member
Thread Starter
 
TotalKos's Avatar
 
Join Date: Apr 2002
Location: the T-Dot
Posts: 171
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Disc Brakes squeal

Hi there, I was hoping someone could help me get rid of the loud annoying squeal that comes from both my front and rear when I use my discs. I thought this would go away after awhile of use and it's been about 5 months now and it's still there. It's so loud I would almost rather not use the brakes and smash into stuff to stop. Oh yeah, it is only when there is humidity in the air or rain etc.
TotalKos is offline  
Old 06-22-05, 03:18 PM
  #2  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by TotalKos
Hi there, I was hoping someone could help me get rid of the loud annoying squeal that comes from both my front and rear when I use my discs. I thought this would go away after awhile of use and it's been about 5 months now and it's still there. It's so loud I would almost rather not use the brakes and smash into stuff to stop. Oh yeah, it is only when there is humidity in the air or rain etc.
Discs do tend to squeal when wet. However that bit on humidity (if it's not a joke) is odd. Have you cleaned the rotors with denatured alcohol yet?
__________________
Raiyn is offline  
Old 06-22-05, 03:23 PM
  #3  
TotalKos
Senior Member
Thread Starter
 
TotalKos's Avatar
 
Join Date: Apr 2002
Location: the T-Dot
Posts: 171
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
It is not a joke about the humidity. It happens anytime except super dry conditions. I haven't cleaned the rotor with denatured alcohol yet. What is denatured alcohol? I only know of rubbing alcohol, is that the same thing?
TotalKos is offline  
Old 06-22-05, 03:34 PM
  #4  
dooley
Senior Member
 
Join Date: Feb 2005
Posts: 541
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Try putting copaslip on the back of the pads.
dooley is offline  
Old 06-22-05, 08:16 PM
  #5  
nirvanaschains
Senior Member
 
Join Date: Apr 2005
Location: Chicago, IL
Posts: 144

Bikes: 2004 GT-Idrive 3.0

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Its pretty much the same thing, i just use rubbing alcohol, and its worked every time.
nirvanaschains is offline  
Old 06-22-05, 08:27 PM
  #6  
phantomcow2
la vache fantŰme
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Rubbing alcohol will work. you just use the alcohol and wipe down the rotor so that it gets any contaminants on the rotor off, without leaving a residue.
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline  
Old 06-22-05, 09:26 PM
  #7  
G4teamG
Senior Member
 
G4teamG's Avatar
 
Join Date: Nov 2004
Location: Whittier, Ca
Posts: 204

Bikes: 2009 Specialized Robaix Elite

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Like Raiyn says use denatured alcohol. You can buy it at Home Depot. I clean my rotors every 3 rides (50-75 miles) and no more squeal. Do not use rubbing alcohol it will leave a residue. Also, Use a clean shop towel. You'll be surprised how much residue is on the rotors. Good luck.
G4teamG is offline  
Old 06-22-05, 09:38 PM
  #8  
TotalKos
Senior Member
Thread Starter
 
TotalKos's Avatar
 
Join Date: Apr 2002
Location: the T-Dot
Posts: 171
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Thanks all for the help. I've just put some rubbing acohol on now and I'll pick up the other stuff tommorrow.
TotalKos is offline  
Old 06-22-05, 10:35 PM
  #9  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by dooley
Try putting copaslip on the back of the pads.
No. Don't put anything on the back of bicycle disc brake pads. I swear I don't know where you get this crap.
__________________
Raiyn is offline  
Old 06-22-05, 10:58 PM
  #10  
mtbikerinpa
Shimano Certified
 
mtbikerinpa's Avatar
 
Join Date: Dec 2004
Location: PA
Posts: 1,840

Bikes: 92 Giant Sedona ATX Custom

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 37 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
copaslip/disc brake-quiet will help when used propperly to reduce chatter between the pad and the piston, but it is a solution to a non-problem. The pads will not chatter unless contaminated, and it is nice to have that indicator. Furthermore, when it is the slightest way misapplied, it will cause the pistons to stick(I had to rebuild a caliper where that happened.)
One other trick of the trade is heat. Periodically I find running a propane torch around the rotor(not center) to cook off any oily film works well. Observe for flame colors. When it is clean there will be no change. Not a normal operation, but I just spent a while getting fork oil(blown fork seals) off the pads and rotor. If done propperly, the torch and solvent can clean the pads as well. Not a beginner move though, so don't try it at home.
mtbikerinpa is offline  
Old 06-22-05, 11:25 PM
  #11  
chris_pnoy
ride like theres not 2mrw
 
chris_pnoy's Avatar
 
Join Date: Jun 2005
Location: Baltimore MD
Posts: 385

Bikes: Trek Bruiser 1

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
^ Hmmm... that is an interesting technique.
chris_pnoy is offline  
Old 06-23-05, 01:41 AM
  #12  
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Just buy some disk brake cleaner, your all being too fussy.
blue_neon is offline  
Old 06-23-05, 01:46 AM
  #13  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by blue_neon
Just buy some disk brake cleaner, your all being too fussy.
How many times do I need to say this? The only thing you should be using on BICYCLE ROTORS is
DENATURED ALCOHOL

I swear every time we get a squealing disc brake thread on here we have to go through this again.
Look at your owner's manuals people.
It says Denatured (some will say rubbing) Alcohol. It does not say: Automotive Brake Cleaner, or gasoline, or even Moose Piss.
It says
DENATURED M**********ING ALCOHOL
It isn't about the rotor being affected its the pads
__________________
Raiyn is offline  
Old 06-23-05, 01:52 AM
  #14  
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Calm down. The bike shop i'm working in uses disk brake cleaner, and we havn't had any problems / reports of squeeling brakes. Heck, bike shops even sell disk brake cleaner.
blue_neon is offline  
Old 06-23-05, 01:56 AM
  #15  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by blue_neon
Calm down. The bike shop i'm working in uses disk brake cleaner, and we havn't had any problems / reports of squeeling brakes. Heck, bike shops even sell disk brake cleaner.
I'm cool as a cucumber.
Like I said. Check the manual. Besides denatured alcohol is cheaper and won't leave the residue that some auto brake cleaners will leave. These rely on the heat generated from a car's rotors to cook off
__________________
Raiyn is offline  
Old 06-23-05, 02:00 AM
  #16  
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Anything sold in a bike shop is expensive. Thats my plane, I work in one, get paid, and get things cheap. Mwahahahaha. I got a new Bottom Bracket, hub service, new cables, pads, seat and powerlink for $25 AU .

Where do you get dentured alchol from anyway?
blue_neon is offline  
Old 06-23-05, 02:00 AM
  #17  
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
ohhh and add on $5 and I got a truing wrench
blue_neon is offline  
Old 06-23-05, 02:03 AM
  #18  
[bEn]
Just Ride
 
Join Date: Sep 2004
Location: Melbourne - Australia
Posts: 1,343

Bikes: 2005 Giant Yukon with the works.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Raiyn
How many times do I need to say this? The only thing you should be using on BICYCLE ROTORS is
DENATURED ALCOHOL

I swear every time we get a squealing disc brake thread on here we have to go through this again.
Look at your owner's manuals people.
It says Denatured (some will say rubbing) Alcohol. It does not say: Automotive Brake Cleaner, or gasoline, or even Moose Piss.
It says
DENATURED M**********ING ALCOHOL
It isn't about the rotor being affected its the pads
I've seen you say that a lot of times when it comes to threads like these....
[bEn] is offline  
Old 06-23-05, 02:05 AM
  #19  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by blue_neon
Where do you get dentured alchol from anyway?
Hardware and camping supply stores will generally have it
__________________
Raiyn is offline  
Old 06-23-05, 03:42 AM
  #20  
Roasted
huffy owns
 
Join Date: Apr 2005
Location: Pennsylvania.
Posts: 572

Bikes: Catrike Expedition, KHS XC 204 mountain bike, Nashbar SS Road Bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Is this recommended for us bikers out here who do not have disc brakes? (regarding the outside walls of the rim where the pads rub).
Roasted is offline  
Old 06-23-05, 04:19 AM
  #21  
blue_neon
Elite Rep
 
Join Date: Aug 2004
Location: Melbourne - Australia
Posts: 2,096
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I doubt very much so.
blue_neon is offline  
Old 06-23-05, 06:27 AM
  #22  
phantomcow2
la vache fantŰme
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Roasted
Is this recommended for us bikers out here who do not have disc brakes? (regarding the outside walls of the rim where the pads rub).
I use rubbing alcohol on the rims, seems to work. Some say it eats at the rubber, so i wipe off the rims when i change tires.
__________________
C://dos
C://dos.run
run.dos.run
phantomcow2 is offline  
Old 06-23-05, 03:43 PM
  #23  
Raiyn
I drink your MILKSHAKE
 
Raiyn's Avatar
 
Join Date: Jul 2002
Location: St. Petersburg, FL
Posts: 15,061

Bikes: 2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Roasted
Is this recommended for us bikers out here who do not have disc brakes? (regarding the outside walls of the rim where the pads rub).
You can. It evaporates quickly enough not to make a difference to your tires or pads. If your rim brakes are squealing it's usuallly either a toe-in issue or pad glazing both of which are easy fixes
__________________
Raiyn is offline  
Old 06-23-05, 07:41 PM
  #24  
myca
Commuter
 
Join Date: Nov 2004
Location: Boston, MA
Posts: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have a pair of Hayes HFX9 hydraulic brakes and experience the same deafening squeal. It happens ďall the timeĒ, whether the conditions are dry or wet. Iíve used alcohol to clean the disc and the pads which seem to eliminate the problem for about two miles worth of riding but then itís back to the squeal. Itís gotten to the point where it actually vibrates the bike while braking. The problem continues despite changing the pads every 700 miles or so. Iíve had the brakes serviced at a few bike shops to no avail. Would I be throwing my money away by replacing the disc as well as the pads? Iím realizing itís hard to find a definitive answer to this problem. Any additional advice appreciated.
myca is offline  
Old 06-23-05, 07:54 PM
  #25  
cydewaze
Emondafied
 
cydewaze's Avatar
 
Join Date: May 2005
Location: Maryland
Posts: 4,939

Bikes: See sig

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 63 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I found that a little teflon lube gets rid of the squeel.




Just kidding...
__________________

my bike page - my journal
Current Stable: Trek Emonda SL - Trek Top Fuel 8 - Scattante XRL - Jamis Dakar Expert - Trek 9700 - AlpineStars Al Mega
cydewaze is offline  

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.