brembo coffin master cylinder has a reservoir with less capacity than the two calipers it feeds. thus, if you put in new brake pads and fill up the reservoir and then use up the pads without adding more fluid, it will get air into the system. then when you go to put in new pads, you have to remove fluid from the reservoir.
if you buy new rotors, buy the great stuff...
www.braketech.com (
pic of stainless version on my old 916) the ductile iron rotors are sawed off from a continuous bar. they hold up, not like the cast ones found elsewhere on the market (which allegedly will crack ???) anyhow, i've used stainless, brembo cast iron, and the braketech ductile iron and the BT brakes are head and shoulders above the rest.
i suspect you could buy a single BT ductile iron rotor FIRST and probably be happy with that. in fact, i'm contemplating doing a dual to single rotor conversion to my m900... see, my aprilia rs250 race bike uses two stainless rotors, but for my aftermarket wheel, i put on a single BT ductil iron rotor and it stops better than the dual stainless rotors. 8)
where's Sailers? he likes `em, too.

chris