Tarheel Trailblazers Message Board - Squealing brakes from sitting in garage

05/09/25 at 9:34am

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Squealing brakes from sitting in garage (Read 1041 times)

Ridefour15 Little Ring Offline Work Ride Tarheel Trailblazers Posts: 509 Location: Charlotte/Pineville, NC Joined: 11/18/12	Squealing brakes from sitting in garage 03/25/16 at 5:08pm	Print Post
	My mountain bike has barely been ridden in the last year. The last two rides I went on I had to sand the pads and clean the rotors to re-bed the pads before I could ride because they were howling like mad. I did the same thing this past weekend before riding Tuesday and they were find on Tuesday's ride, but last night when moving the bike the pads howled in the garage just feathering them while rolling across the floor. The bike spends all its time in the garage hung on the wall. XT M785 brakes with Shimano pads and Avid rotors. Up until May 2015 I was riding it once every 2-4 weeks with no issues, but I've only been on three rides since then with each being months apart. Any ideas what causes them to apparently glaze over or cause squealing? The pads don't look particularly off-color when I sand them. Am I better off replacing pads and/or rotors? With the sanding and cleaning with alcohol I feel like it should be problem solved, but it's obviously not the case.

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jonesn Big Ring Offline Posts: 1112 Location: South Central Charlotte USA Joined: 03/16/11	Re: Squealing brakes from sitting in garage Reply #1 - 03/25/16 at 5:48pm	Print Post
	I'd resand them and ride more... Just me. I know I don't have an extra $150.00 just laying around for new rotors and pads.

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Enoch Forum Administrator IB Room Project Board In The Loop Offline Walked with God and he was not Posts: 8702 Joined: 05/08/04	Re: Squealing brakes from sitting in garage Reply #2 - 03/25/16 at 5:52pm	Print Post
	I would sand the rotors too. THey prolly got something on them while haging in the garage.

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Ridefour15 Little Ring Offline Work Ride Tarheel Trailblazers Posts: 509 Location: Charlotte/Pineville, NC Joined: 11/18/12	Re: Squealing brakes from sitting in garage Reply #3 - 03/25/16 at 5:55pm	Print Post
	I'll take the rotors off the hubs and sand them more thoroughly, then. Maybe take a flame to the pads as well. I originally thought they got something on them that caused the squeal the first time, but it's been barely three days since my last ride and they're already squealing again.

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Enoch Forum Administrator IB Room Project Board In The Loop Offline Walked with God and he was not Posts: 8702 Joined: 05/08/04	Re: Squealing brakes from sitting in garage Reply #4 - 03/25/16 at 6:00pm	Print Post
	I just spin mine while pinching them with sandpaper. Watch out for the spokes. They are like magnents for any kind of airesol sprayed in the garage

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Ridefour15 Little Ring Offline Work Ride Tarheel Trailblazers Posts: 509 Location: Charlotte/Pineville, NC Joined: 11/18/12	Re: Squealing brakes from sitting in garage Reply #5 - 03/26/16 at 6:49pm	Print Post
	Enoch wrote on 03/25/16 at 6:00pm: I just spin mine while pinching them with sandpaper. Watch out for the spokes. They are like magnents for any kind of airesol sprayed in the garage I did that last time with the sandpaper, but maybe it wasn't enough. And I don't spray anything in the garage, but there's likely lots of cat litter dust. That could be a culprit now that I think of it.

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MTBman1127 Small Cog Offline Work Ride Drink Beer Posts: 469 Location: Concord Joined: 12/02/13	Re: Squealing brakes from sitting in garage Reply #6 - 03/27/16 at 2:21am	Print Post
	I like a good clean scotchbrite pad on the rotors. You can also use isopropyl alcohol and bake the pads to clean them.
	« Last Edit: 03/27/16 at 2:22am by MTBman1127 »
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sCvHeaVens Small Cog Offline Work Ride Tarheel Trailblazers Posts: 447 Location: Charlotte, NC Joined: 02/12/15	Re: Squealing brakes from sitting in garage Reply #7 - 03/28/16 at 12:26pm	Print Post
	You can take them off; hit them with alcohol and take a flame to them (I find this works best vs sanding)... just make sure you hit them with a flame until you see smoke from the stuff burning off (I use a lighter and it works fine)... I have heard stories of this process causing them to fail, but I myself did this a few weeks ago and they have been fine (on the back)... Or if you're concerned about the cost you can get brake pads for $5.99 online or off brands for $3-4. There are a couple of LBS that you can get them for $11-13 as well. IMO $10-$20 to increase safety; no brainer. The rotors are more than likely fine (in my experience its been the pads) but I would wipe them down with alcohol as well.

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