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Old 06-29-09, 06:42 PM
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JohnDThompson 
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Are you tightening them properly? There should be two nuts holding the caliper arms onto the pivot bolt. The inner nut sets the adjustment (you likely need a thin brake wrench to do this right); the outer nut is a locknut to prevent loosening. You tighten the inner nut down against the arms until there's no slop in the arms, but not so tight that they can't pivot freely. Then you use the thin brake wrench to hold it in place while you tighten the locknut against it. It's pretty common for it to come out a little tighter due to the tension on the bolt, so you may have to back the inner nut off a little to let the caliper arms move freely again. It may take some trial and error until you develop a feel for how it works.
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