Yes, QUITE rare compared to the usual suspects like the Merc
S-Class, and BMW 7-series..and regarding brake rust, tomsss and
HeXy all say clearly liao..as long as the cast iron brake discs
comes into contact with water, it will rust ON the surface within
an hour..but it's only ON the SURFACE..after a little braking when
you drive, all gone.. 
ONLY Carbon-Ceramic brakes don't rust..