MR>I wonder why they still use drum brakes in the rear wheeltrain when
MR>disk brakes are so much simpler and effective. Okay they fade more
MR>when wet or hot but not that much. It can't be cost alone, by now the
MR>cost of either system is about the same expense.

It is cost. It is small but Drum brakes are still cheaper.
One might say but how Much. Well in most industries having any sort of
volume production even a couple of dollars per unit can be significant.
And if it is a fairly high volume production item even less then a
Dollar is significant.

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 þ SLMR 2.1a þ This note from El Cajon California USA