Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

When my disc brakes squeal...

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.

When my disc brakes squeal...

Old 08-12-22, 10:14 PM
  #1  
Brad Bike
That guy
Thread Starter
 
Join Date: May 2018
Location: The heart of Ohio
Posts: 47

Bikes: 2012 Felt FC build

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 25 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
When my disc brakes squeal...

I've been told to:
(1) pull off my rotors, wipe them down with rubbing alcohol, lightly sand them, and wipe with alcohol again, being careful not to touch them with bare fingers or get any oil/grease of any kind on them
(2) pull out my brake pads and sand then down
(3) reassemble everything and re-bed my brakes.

My questions are:
(1) do these steps check out?
(2) what grits of sandpaper should I use on the rotors and brakes pads?
(3) do you guys it necessary to re-bed after washing the bike or riding in heavy rain even without going through all the above steps (except maybe rubbing the rotors down with alcohol)?

Thanks!
Brad Bike is offline  
Old 08-13-22, 08:42 AM
  #2  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 25,719

Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones

Mentioned: 138 Post(s)
Tagged: 1 Thread(s)
Quoted: 5157 Post(s)
Liked 2,699 Times in 1,597 Posts
Originally Posted by Brad Bike View Post
I've been told to:
(1) pull off my rotors, wipe them down with rubbing alcohol, lightly sand them, and wipe with alcohol again, being careful not to touch them with bare fingers or get any oil/grease of any kind on them
(2) pull out my brake pads and sand then down
(3) reassemble everything and re-bed my brakes.
You might try brake cleaner instead of alcohol. Or use acetone rather than alcohol. Brake cleaner is generally an acetone/toluene mixture now. Itís a bit more effective than alcohol on the oils that can get on rotors. You may need to just change the pads. You may also need to change the pad material.

My questions are:
(1) do these steps check out?
(2) what grits of sandpaper should I use on the rotors and brakes pads?
(3) do you guys it necessary to re-bed after washing the bike or riding in heavy rain even without going through all the above steps (except maybe rubbing the rotors down with alcohol)?

Thanks!
You are on the right track. For sanding the pads, a fine grit (250) should work. Make sure the paper is on a flat surface and the pads are flat to that surface. You donít want to sand the pads and have them be beveled because you sanded them at an angle.

Be aware that all this may not work. If the pads are contaminated with oil, the oil gets further into the pads than they will with rubber. Disc brake pads are more porous and hold oil much deeper.
__________________
Stuart Black
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
cyccommute is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2022 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.