|   dumb brake ?? | Pablo
Sep 18, 2001 11:28 AM | | I'm a bad mechanic, so please help with my dumb question:
On Sunday, I adjusted the toe-in of the Avid Shorty 4's on my LeMond Poprad to cure an obnoxious squeal. It worked, but now on moderate to hard braking, I get a high-frequency vibration in the rear end that's actully uncomfortable at it vibrates the seat. It didn't do this with the bike's initial setup. I am sure with a certain amount of trial & error adjusting the pads, I can prolly get a no-squeal/no-vibe pad alignment, but is this maybe what a brake booster is supposed to cure? I have to admit I've never ridden a bike that seemed to need one, so I don't know.
Thanks! |
| just a bit more fine tuning | flatlander
Sep 18, 2001 4:17 PM | | Sounds like you toed in the brake pad a bit to much, when you toe in a brake pad its very minimal. When the front of the pad touches the rim, the rear of the pad should be about the thickness of a credit card or approx. 1/16 th away from the rim no more. What you want to do is disconnect the cable from the brakes so their hanging loose, then the easy way to do this, after you loosen the pad, is by getting the correct size shim and put it under the back part of the pad, then line up the pad on the rim and tighten it in place. You need to make sure that the pads are tight, that they make full contact with the rim once pressure on the levers is applied (another words not just the edge of the pad comes in contact with the rim) and that they aren't hitting the tires or going off the rim on the bottom. With a little practice it becomes pretty easy good luck :) |
| thanks!! | Pablo
Sep 18, 2001 5:21 PM | | That's prolly it - i did it pretty quick in the middle of a ride. I appreciate your help! |
| '99 LX parallel push | Skinny D
Sep 19, 2001 8:34 AM | | I have a bit of play in my '99 LX parallel push brakes. Hence they can be set up with toe in but when the wheel turns it flexs the pad/parallel mech/brake arm and the toe in is changed.
Any comments, sense would say that the pads should be set up with them pushed the way the wheel would push them. I've resorted to toeing them in until they stop squeeling. |
| shim kit is in order...... | heff®
Sep 19, 2001 9:02 PM | | The kit costs 3 bucks or so, comes with a dozen paper-thin washers and new pivot fixing screws. Put as many washers as you can fit, both front and back of the Parallel Push linkage, and tighten that sucker up.
Getting Shimano PP brakes to stop squealing is an excersize in futlity, I've never found a reliable method that works on every bike/fork combination. On my old SX-R, I got it to stop by using the shim kit, a ti brake booster, and Koolstop red pads. Sold the fork to a riding buddy, with the same brakes, and NOTHING would stop his squeal. I even tried toeing the pads out instead of in, so the trailing edge hit first, no luck. I finally got him a set of Avids.
Shimano knows of this problem, and has no solution for it.....gee, guys, how about redesigning the linkage?
heff® |
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