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Brakes Vibrate when braking

Old 08-31-10, 06:08 AM
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Brakes Vibrate when braking

my brakes vibrate when braking. Ive realized the brazons are longer than the Vbrake so it isnt pinched by the bolt and frame.

Is that what is supposed to keep the brakes from vibrating?

Ill just put some washers on if thats the case.
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Old 08-31-10, 06:20 AM
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Maybe a few more details would be appropriate? What brakes, on what, and when did this start?
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Old 08-31-10, 06:49 AM
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I beleive they are DeoreXT V brakes (yr 2000?) on my suteki and i suppose it has been always vibraty.
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Old 08-31-10, 09:36 AM
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Have you addressed the condition of the rim's braking surface as well as the condition and positioning of the brake pads?
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Old 08-31-10, 10:12 AM
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The shudder that you probably feel as vibration is actually a very low frequency squeal. It's just too low a frequency to hear it.

V brakes arms fit onto a sleeve so they can pivot. It is that sleeve that actually gets clamped by the screws holding the brakes to the posts. If the SLEEVE is not being properley clamped then you need to do something. But more often the arm itself is a bit loose on the sleeve. That part is normal and it must be a little free so that you can move the arms easily.

You want to play with other things to break the feedback loop that is causing the shudder. THings like altering the angle of the pads or changing the type of pads or just keeping the rims clean and pad faces clean.

One other thing you could try if the arms sort of rattle on the pivot points. Mix up a little bit of grease with something like lacquer thinner so it's runny. Dribble that down into the pivot point between the arm and the fixed sleeve. Wiggle the arms to work it in. When the lacquer thinner dries away the thicker grease may provide enough viscous drag to stop the shudder. Mineral spirits will work too but it takes a lot longer for it to dry away. Like overnight versus 5 to 10 minutes. Or you could use a bit of brake cleaner to thin the grease as well. That would evaporate even faster. If you try this trick it'll be messy so just dribble a couple of drops at a time into the joint and work it in then wait for it to thicken back up before you try another couple of drops. By the time you work your way around alll 4 arms and wait a few minutes you can add a couple more drops to each arm and work them in.
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