Flyfisher -
In cars, at least, there are many causes of pulsing brakes, the first being out-of-round drums or unevenly worn shoes. Either can result from over-hard braking at some point, or overheated brakes. How old is your TM?
Before you panic about Jim's grease problem or my suggestion of non-round parts, why not turn off the boost feature and try it again? If it still pulses, and you are not confident of your brake-diagnosis-and-repair capability, your next step is to take the TM to a brake shop.
Bill
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