Common disk brake vibration cures
Usually this isn't that hard to solve.
It sounds like a vibration, possibly a disk out of round, or badly glazed pads and damaged disk.
First, make sure ALL brake components have been checked for correct installation - spacers on the wrong side etc - and that everything is torqued correctly - disk, mount bolts for caliper, swingarm pivot bolt, wheel nuts, adjusters etc. Mounts not fully torqued to correct spec can cause it.
Then make sure the disk is truly straight - spin the wheel - if you can see ANY wobble there's your problem. Ideally should be within .000-.003" max out of round.
Remove and clean the pads (and the disk) with brake cleaner, if the pads are badly glazed, a last ditch clean with a file over the surface can resurrect them.
Finally, a spot of brake pad grease on the BACK of the pads against the piston may solve it.
Let us know how you do!
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Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com
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