Hey ive got a 600rr with crash damage. The brakes acted funny from day one. When i squeeze the front brakes sometimes the lever will go limp as if the lines have no pressure, and then i am able to squeeze a few more times and pressure will build again. If i push the bike around the parking lot the symptom acts up again, but goes away when the bike is stationary or happens very little.
Ok fine i figured its just air in the lines. So today i flushed the whole system with new brake fluid and did a full bleed job. Everything felt firm at the lever untill i went to push the bike accross the driveway and guess what? Limp lever again!!
Could there be a problem with the master cylinder? The cap has some scratches from when it was low sided so its possible the master cylinder took a hit. I checked the lines for any harsh bends or pinches and everything looks good. So im at a loss. Anyone have some suggestions? Thanks.