So I just replaced by stock brake pads with new Jagwire's. I noticed that the front right brake pad now has something wrong with it, the front of the pad touches the rim is a couple mm before the back of the pad. I'm trying to figure out what's wrong, I don't know if something is bent or what but any help would be great.[IMG]cyclingforums.com500Open ↗[/IMG]
Road Cycling · Public discussion
Help With Brakes
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- 16 May 2011
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- 21 May 2011
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- crawfordguard
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There is nothing wrong with it. The front of the pad is supposed to contact the rim first, otherwise you get a loud squeaking sound from the wheels every time you brake. As your pads wear, it begins to appear that the entire pad is contacting at the same time, but the pressure is greater at the front which prevents the squeaking. In the old days, it was common that when you were building or setting up a bike, you would slightly bend the brake calipers to toe-in the pads. This is no longer needed as most brake calipers come from the factory slightly toed-in. Also some pad manufacturers make the pads so that they are slightly toed-in. Your set up doesn't appear to be too badly toed-in.
This is a link to Sheldon Brown's website. Scroll on down to the heading "Toe-in" and it will explain it in better detail than I can. There is also a link on his page to an article written by Jobst Brandt that gets pretty technical.:sheldonbrown.comgloss ta o.htmlOpen ↗
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a front brake making a vibration of the fork and wheel, could the toed-in you explain being the cause ?
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I can't judge from your photo but you are probably getting noise and vibration because one pad is toed in and the other is not.
If you loosen where the brake pad holder attaches to the caliper, you can adjust the toe in as well as the up and down position on the wheel. (As well as rotation.)
Make sure that the pads contact the rim's braking area evenly in line with the curve of the rim and each pad has a touch of toe in. (Closer together at the front.) Make sure the entire pad is over the rim's braking surface. E.g. not up too high where it is even a bit off the metal surface and of course it can't be allowed to touch the tire. And make sure it is not down too low where it is slightly off the rim's braking surface. When you apply the brakes they should both contact the rim at the same time. If you see that one pad is pressing first and moving the wheel toward the other pad then ether your wheel is not installed centered, or you need to adjust the centering of your caliper.
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