I am pretty sure my master cyl is shot. Brakes are new and just serviced in may, just did complete flush and fill and bleed whole system and banjo...brakes work but barely. not mush, just no real stopping power (cannot lock up rear tire at all or skid, even when tried). works OK for slow speed stuff.
I bought a new one from a wrecker for cheap, just incase. Is there a way to know for sure that this one is shot before I install a new one? Or do i even bother, could just put the new one on and see if it works
BTW guy who dropped my bike before I bought it smashed the crap outa the peg and switch, and res - those are all fixed. so it took some impact as its mounted right behind the peg/heelguard.