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               Originally Posted by 
              Woottonboy  
              particularly the front its caused by the bi metal that is used in the brake pads having a galvanic effect with the tin on the metal spokes.
              
 its because some bean counter somewhere said...
 
 'Oi we can save $10 a bike by using inferior Italian junk'
 
 rather than doing it properly: ie XT's build from 1965 - 2004.
 
 Yamaha doesn't do warranty on it either.
 
 BUT don't get me started. I am eventually going to replace all mine. JTR in Australia does spoke sets to fix the problem.
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         That's exactly why I started using organic break pads following my Z's first winter - particularly when the front break disc started showing signs of pitting after a few days parked in my garage.