Hi All, I am having a fantastic time (read as "pain in the butt) trying to get my front brake system working again after it locking up on me (for a second time). I have pulled the front caliper apart and given it a good clean up. The caliper seals were replaced about 12 months ago (only ridden twice in that time) after I had the brakes lock up on me the first time. This time around I suspected the master cylinder to be the culprit so pulled it apart to find some gunk in there like the brake fluid had gone "off", pulled it apart and replaced the piston & cup set. Pushed new fluid through the lines, all seemed good there. Now I can't seem to get the M/C to prime properly and force liquid down the lines. I can push liquid from the caliper all the way back up to the banjo at the M/C no issues and also into the M/C through the return port (while it does take a bit of a push on the syringe to get it to go back into the M/C. I have a vacuum bleeder kit and thought that would sort the issue but I can not for the life of me get the system to work properly and get pressure on the lever. It is sending me around the twist. Any tips? My next thought is to try and replace the M/C itself and probably the brake line. Anyone got a good condition / functioning GSX250F front master cylinder laying around?