Rear brake squeal
06-09-14 | 09:15 PM
#1
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From: Atlanta, GA
Bikes: Dave Kirk Custom, Clockwork Bikes Custom, Batavus Course Specialized HardRock x2 Trek 700 MultiTrack 1991 Trek 950 SingleTrack. Miyata Three Ten
Rear brake squeal
I know this one has been posted a gazillion times, and I've researched it, but nonetheless, I still have problems with the rear cantis squealing like crazy. The rims are clean, I took off the pads and sanded them to an even finish. They are toed in, but yet they still sqeal really loud. The front are no problem. The front rim is a higher quality Sun Ringle double wall while the rear is an off the rack wheel from PB that has a wear indicator groove (which also deforms the brake pads as they wear). The only other difference is that the front canties get 'pulled' since they are in front of the fork, while the rear ones get 'pushed' being behind the seat stays. I guess the next step is to take some steel wool to the rear rim and try to scruff it up a bit.
Do higher quality rims have less tendency to squeal?
Thanks!
Jon
Do higher quality rims have less tendency to squeal?
Thanks!
Jon
06-09-14 | 09:42 PM
#2
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Newly installed shoes with fresh surfaces will have a tendency to squeal, the same way new chalks screeches on a chalkboard. You can fool with the toe-in, but if you just live with it a short while it'll resolve itself most of the time.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
06-10-14 | 07:03 AM
#3
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From: Rochester, NY
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We were just talking about this yesterday at work. We all agreed that new and clean made the tendencies to squeal worse (along with moisture and oils/lubes on the rims).
I mentioned my technique of placing a bit of garden mulch (as in bark) between the rim and pad then riding around the parking lot to help silence the offensive brake. Andy.
I mentioned my technique of placing a bit of garden mulch (as in bark) between the rim and pad then riding around the parking lot to help silence the offensive brake. Andy.
06-10-14 | 07:25 AM
#4
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From: Denver, CO
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I know this one has been posted a gazillion times, and I've researched it, but nonetheless, I still have problems with the rear cantis squealing like crazy. The rims are clean, I took off the pads and sanded them to an even finish. They are toed in, but yet they still sqeal really loud. The front are no problem. The front rim is a higher quality Sun Ringle double wall while the rear is an off the rack wheel from PB that has a wear indicator groove (which also deforms the brake pads as they wear). The only other difference is that the front canties get 'pulled' since they are in front of the fork, while the rear ones get 'pushed' being behind the seat stays. I guess the next step is to take some steel wool to the rear rim and try to scruff it up a bit.
Do higher quality rims have less tendency to squeal?
Thanks!
Jon
Do higher quality rims have less tendency to squeal?
Thanks!
Jon
Another cause may be the frame. If the frame is too light in the brake area, the seat stay can twist which causes the toe of the brake to lift off the rim and chatter. This is a fairly rare problem, however, compared to the caliper itself.
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Dreamin' of Bemidji Down the Mississippi (in part)
Plan Epsilon Around Lake Michigan in the era of Covid
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Stuart Black
Dreamin' of Bemidji Down the Mississippi (in part)
Plan Epsilon Around Lake Michigan in the era of Covid
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!
06-10-14 | 09:22 PM
#5
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From: Atlanta, GA
Bikes: Dave Kirk Custom, Clockwork Bikes Custom, Batavus Course Specialized HardRock x2 Trek 700 MultiTrack 1991 Trek 950 SingleTrack. Miyata Three Ten
They are the Shimano CX-50's and have maybe 500 miles on them. I stopped by the lbs on the way home tonight and he made some adjustments and tightened up the spring by moving it to the top hole in the canti boss mounts. He pretty much got the squeal out. He mentioned that the long arms can contribute to the squeal. The brakes comes with 3 different barrels that determine the distance between the brake pad and the mount on the bosses. I went with the longest ones because that is what the yoke seemed to fit. If I went with one of the shorter options, I think I would lose mechanical advantage or possibly need a new yoke.
