I had to drill out the rear brake reservoir screws on my '98 Suzuki GS500E as they'd rotted but in doing so I managed to snap the drill bit. Carelessly, the top of the reservoir was off by this point and the inch or so of drill bit may have ended up going into the reservoir and down the pipe that connects to the master cylinder.
Since the fluid is due for changing can I simply detached the master cylinder, invert it and drain out the fluid and confirm the drill bit is either in there and remove it, or not there at all. There is no ABS or anything so I hope I can simply refill, bleed a few times and all will be well but I'm not sure how well master cylinders react to this sort of treatment? Is there anything to watch out for when draining down a master cylinder on a bike?