FZR250 stiff brakes

[MSTRS:Me]

Nope brakes weren't on all the time. Don't ask me how it worked it just did. Its a lot smoother and easier to brake and stops a lot harder than before.

Then I'd be worried about a problem with the master cylinder piston movement.
It is simply not possible to 'have too much fluid in the system' - at least not from the m/c piston seal all the way to the caliper pistons. The only way to get more in there is to have it under pressure, which means that the caliper pistons will be activated against the pads.

[SS90]

Er, not quite.

If (and this has been known to happen), someone was to fill the master cylinder to capacity, and the caliper pistons where all the way out (really worn/missing pads), then, the caliper pistons where pushed back (to refit the pads), then the fluid that was behind the fully extended pads would be forced back up into the master cylinder, thereby overfilling the master cylinder, and, depending on the design of the master cylinder, the lever can feel rock hard, but not apply much pressure to the caliper pistons....remember, there is a return valve in the master cylinder, and it can't operate correctly if it is over full.

That said, if the owner has any doubts, it would be wise to take it to an expert.....brakes are important!

[MSTRS:Me]

So - too much fluid behind the m/c piston causes some sort of hydrolock?

[F5 Dave]

If for example with SS's example & the rubber was ripped/slid out of way & lid breather clogged then there could be an issue. As I said keep looking or it could happen again, for example if the the fluid gets hot it will expand with no where to go.