Bicycle Mechanics - Screaming Brake!!
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05-24-03, 07:15 PM
How do I shut my screaming ........:p
05-24-03, 07:46 PM
toe in the pads, maybe?
Make sure there is no crap on the pads also.
Perhaps take them off and clean them or sand them a little bit to make sure. The screaming (which is vague description) could be a piece of metal lodged in the brake pad rubbing against the braking surface on the rim.
05-25-03, 06:32 AM
I've not found anything that works 100% of the time.
Were they ever quiet?
If so, I assume the pad alignment is OK and go to work on other issues. My first shot is to dress up the pads using a fingernail emery board. It has the right grit and a nice flat surface. If that doesn't work, I go to work on the rim with something like lacquer thinner.
If the brakes were never quiet, I start with the pad alignment with the rim. I adjust the toe in on road calipers by snugging a 6" adjustable wrench onto the arm and slightly bending the arm.
I have the same problem (check my post dated 5-7-03 "Yet another squealing brake problem"). I have tried everything and it still squeals. Only weird thing is that it squeals the loudest on cold mornings and goes away by the afternoon. If I ride the brakes down a hill to warm 'em up the squeals goes away until they cool off. Read my post for ideas and good luck.......you'll need it.
05-25-03, 08:48 PM
Park makes a tool for toeing caliper brakes. It is a slotted lever, that you use to twist the arm.
Oh Great Rev. Chuck ---- If brake pads have the concave/convex washers to adjust toe/tilt wouldn't twisting the arms result in the same thing as "adjusting" toe-in at the pads? Also, wouldn't twisting the arms also throw off the noodle alignment with the clinch bolt?
Thanks George.....Now it makes sense. But bending the arms sure sounds risky but I guess there's no other way. Too bad that somebody doesn't make some kind of tapered pads so that it'll have toe-in automatically when it's installed. Maybe a little thicker so that they can be shaped by a file or sanding block. Just a thought......
05-27-03, 08:27 PM
Jim, sometimes you just gotta bend stuff. You can file or grind a bevel into the pads but if you tweek the arms, on a caliper you only have to do it once.
Road pads are not as bad for squealing as MTB pads, so this is not somethingthat happens a lot, on newer stuff any way.
05-28-03, 12:21 PM
Screaming brake pads, huh?
Same thing was happening on my bike, one time after taking the wheel off and readjusting the brake caliper and pads. It turned out that I put the pad the oooposite way to which it used to be directed and as soon as I reversed it, the scream disappeared.
If caliper bolt is not tightened well, caliper will be loose which will result in "grabbing" brakes - very dangerous.
So, if those particular pads didn't make the noise before, try to change positions few times.
05-29-03, 02:28 PM
Give the pads a sand with an emory board. Clean the rim. You may have to use a 3M pad if it has pad material ground into it.
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