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Shimano 600 brakes drag - Help!(4 posts)

Shimano 600 brakes drag - Help!david l
Jul 16, 2001 10:40 AM
My Shimano 600 front brake calipers are dragging. That is, when the brakes are applied and released, one pad or the other - usually the pad on the left [as you look down from the top] - stays on the rim and makes noise and impedes progress generally. Both calipers move freely on the center bolt. I cannot figure out how to fix it. Anybody know how? Thanks for the help in advance.
re: Shimano 600 brakes drag - Help!Jofa
Jul 16, 2001 2:10 PM
I presume you mean the older 600 brakes which are standard side-pull design. (Actually these are the only ones, but some people call modern Ultegra dual-pivot's '600' just from habit).
If this is the case, there isn't a lot you can do other than manipulate the brake by hand until it's about right, or loosen the mounting bolt in the fork and adjust the whole thing, it if it's way off. The cause is uneven drag in the springs, and this can never be permanently equalised. This poor centre'ing is the one problem with what is probably the best brake design yet; it won't cost you perceptibly in drag, but if you knock a wheel well out of true then your brake will track with the wheel, rather then obstructing it like modern high leverage dual pivots.
Thanks ! nmdavidl
Jul 16, 2001 5:55 PM
centering calipers:d_alex
Jul 18, 2001 7:15 AM
For the front brake caliper, there should be an allen bolt recessed on the backside of the fork. Turning this bolt will center the caliper. Just make sure the caliper is tight enough, first, or it will not hold the position. You can also accomplish the same thing with a cone wrench by turning the flats right by the front mounting point, between the caliper and the fork. To tighten the mounting, use both the allen socket and the cone wrench, and tighten slightly.