Join Date: Feb 2007
Location: Tariffville, CT
Bikes: Tsunami Bikes
Mentioned: 12 Post(s)
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Quoted: 139 Post(s)
You said "in the tube". Do you have internal brake cable housing?
I'd check the following:
1. The aforementioned improperly cut housing - the curly metal bit points in and rubs the cable, binding it ever so slightly.
2. Check the plastic liner in the housing - if it's missing or damaged somewhere it'll increase friction significantly.
3. If you have internal housing, make sure there's enough in there to allow the cable free movement. If it's stretched out inside and you turn the bars or something it may bind.
4. Check the end of the cable to make sure every strand of wire is there. If there's one strand missing (sort of a "gap" in the circumference of the cable), that strand may be tangled up in itself back inside the housing.
5. Make sure the cable housing is big enough to let the cable move freely. If they used a thicker cable in a thin housing, there will be a lot of friction.
6. Make sure there is enough housing that the cable doesn't get pinched. At the same time make sure that there isn't too much housing - a hard curve in short section of cable housing will bind the cable.
7. Verify the brake springs open correctly (it could be binding). When you disconnect the cable from the rear brake, verify that the cable moves freely. Check also the brake lever although that's usually fine.
8. As a last ditch measure, you might be able to increase the spring tension in the rear brake, depending on the model. This works if you have a light action rear brake paired with a lever that doesn't have a spring in it to help the lever return to its "ready" position.
Hope this helps,