Join Date: Jun 2008
Location: Phoenix, AZ, USA
Re: Rear brake rotor is smoking hot
i suspect not 'normal' in this case.
depends on just how hot, but you could have really have cooked them and the rotor.
there is a gotcha! built into ABS2.
in an IABS system the wheel circuit is completely open to the air.
that is to say, worse case scenario, you service the brake system and top off the marks with fluid to 'max'. at the same time the brake pads were low but not replaced. soon after the service you replace the pads and now you have a puddle of brake fluid on the floor under the swingarm.
in order to get the new pads on and over the rotor the pucks must be completely retracted into the caliper.
therefore, any excess fluid is ejected from the system out of the vent hoses when the pads are fully separated.
however, on your ABS2, its basically a closed system. what happens when you retract the pucks into the calipers here when the fluid was at 'max' already? you try to mash the brake fluid back up the hose into the reservoir. that fluid that was taking up volume in the caliper is now pushing against the rubber boot and the air on top of it in the reservoir. the cushioning effect of the boot will allow you to get the pads installed, barely, but when the bike starts moving, and everything gets hot and expands, the pads get tighter and tighter on the rotor. the pads dragging, even slightly, can generate allot of heat.
check the fluid level before riding it.