Chirping noise coming from my front brake caliper/rotor on specialized mountain bike
05-16-13, 07:53 AM
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Chirping noise (Brake caliper/rotor content)
Hello all, I purchased a new specialized hardrock last year and have developed an annoying chirping noise. It happens when I'm pedaling and coasting. I pulled off the front wheel and discovered a few spots where the rotor was rubbing on the caliper. I pulled off the rotor and set it on a flat surface and it seems to not be bent or warped in any way. Is there a way to adjust the caliper at all? or any other thing i could do to get this noise to stop? I have attached pics to show where it's rubbing;
Last edited by gabeham206; 05-16-13 at 08:50 AM. Reason: too long of a title
05-16-13, 08:50 AM
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You can't tell if a rotor is straight by laying it on a table. Mount the wheel and spin it with a dry marker held against the fork blade advancing it slowly until it just touches. You'll probably get a short line where the rotor is warped toward the blade.
You can see the extent of the warpage, by holding a pencil braced against the blade and just touching at the high spot, then slowly turning the wheel to find the section farthest way.
I don't have enough familiarity with disc brakes to tell you the allowable runnout, but if it's slight, you might be able to recenter the brake so it clears both sides all the way around. If the runout is more than 2mm or so, odds are you'll need to see a dealer for help straightening it. This is something you can do yourself if you have decent hand skills.
You can see the extent of the warpage, by holding a pencil braced against the blade and just touching at the high spot, then slowly turning the wheel to find the section farthest way.
I don't have enough familiarity with disc brakes to tell you the allowable runnout, but if it's slight, you might be able to recenter the brake so it clears both sides all the way around. If the runout is more than 2mm or so, odds are you'll need to see a dealer for help straightening it. This is something you can do yourself if you have decent hand skills.
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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.
