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In some cases, what appears to be inadequate mechanical advantage turns out to be that the brake shoes are not "grippy" enough; they may be dirty, or dried out, or of low quality. Better-quality shoes can make a real difference. I particularly recommend Kool-Stop Salmon brake shoes, which have good grip and wear slowly.
In some cases, what appears to be inadequate mechanical advantage turns out to be that the brake shoes are not "grippy" enough; they may be dirty, or dried out, or of low quality. Better-quality shoes can make a real difference. I particularly recommend Kool-Stop Salmon brake shoes, which have good grip and wear slowly.
===Zu hohe Hebelübersetzung===
===Zu hohe Hebelübersetzung===
[[Datei:Breiter_Querzugträger.png|right|Breiter Querzugträger]]
If you have too much mechanical advantage the lever will be all-too-easy to pull, but it will run out of travel and bump up against the handlebar before the brake is fully applied. Once the lever hits the handlebar, it doesn't matter how much harder you squeeze! If you try to correct this by tightening up the cable, you will wind up with the brake shoes too close to the rim when at rest, which will cause them to rub, especially if the wheel isn't perfectly true.
If you have too much mechanical advantage the lever will be all-too-easy to pull, but it will run out of travel and bump up against the handlebar before the brake is fully applied. Once the lever hits the handlebar, it doesn't matter how much harder you squeeze! If you try to correct this by tightening up the cable, you will wind up with the brake shoes too close to the rim when at rest, which will cause them to rub, especially if the wheel isn't perfectly true.
Excessive mechanical advantage can often be reduced by raising the cable yoke and lengthening the transverse cable, so that it makes a sharper angle around the yoke. Unfortunately, there isn't always room to raise the yoke far enough, especially in the rear of smaller frames.
Excessive mechanical advantage can often be reduced by raising the cable yoke and lengthening the transverse cable, so that it makes a sharper angle around the yoke. Unfortunately, there isn't always room to raise the yoke far enough, especially in the rear of smaller frames.


A special wide yoke sometimes helps with this. It causes the transverse cable to run at a sharper angle than it would with a conventional yoke.
A special wide yoke sometimes helps with this. It causes the transverse cable to run at a sharper angle than it would with a conventional yoke.
Wide yoke
 


If you have too much mechanical advantage, as with a touring bike or tandem with drop-bar-type levers, you can, in some cases, use a pulley adaptor to convert your conventional cantilevers into direct-pull units. Note however that a pulley will result in fatigue failure of the cable sooner or later, so check it frequently.
If you have too much mechanical advantage, as with a touring bike or tandem with drop-bar-type levers, you can, in some cases, use a pulley adaptor to convert your conventional cantilevers into direct-pull units. Note however that a pulley will result in fatigue failure of the cable sooner or later, so check it frequently.


canti-v
[[Datei:Canti-v.jpg|center|250px|Umbau einer Cantilever-Bremse zu einer Direktzugbremse]]


==Variable Hebelübersetzung==
==Variable Hebelübersetzung==
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