hi! i had the same probleme,,,, i just open the 2 caps of the oil brake canister,,and push with my finger the small plastic pieces that float on top,, and the light dissapeer !
then the nex morning the light came on,, so this time i just sit on the bike and bounce it and the light dissapeer,,,,so i put a little more brake oil in the one who seem lower then the other and nor probleme sinced then,
i talk to the mecanic men in garage and he said ,there is sensor for oil if too low,,,in container,,,so soon the brake pad are getting smaller then oil go down in container and the light came on,,,,
make sence to me!