This embarrases me a little bit, but I hope it helps someone: I thought I had busted my rear master cylinder right? (I suspected some aluminum dust had scraped the inside while fabricating my footpegs...) On my footpegs the master cylinder is retained in a near vertical manner. I decided to take it off completely and purged the system while the master cylinder was held in a 45 degree angle, with the ports "facing up". Boom. Rock solid rear brake feel in less than 15 minutes, without sirynge, mighty back or anything! Oh yeah, the caliper was held high, the brake line completely vertical and the purge nut at the highes point. The brake pads were pushed all the way inside the caliper before beginning to purge. I connected some transparent hose to the purge nut with some brake fluid in it. Mind you, that transparent hose was curved up so the brake fluid was always in contact with the purge nut opening. I opened the reservoir, filled with brake fluid and opened the purge nut. Then I pushed the brake pedal, closed the nut, released. Opened the nut, pushed the brake pedal, closed the nut, released brake pedal. I refilled the reservoir as needed and repeated.
It was purged in less time than I used to type this. When no more bubbles or foam was seen on the transparent hose I closed the purge nut definetely. Then installed the caliper back again. I pumped the brake a few times to make the brake pads reach the disk, refilled the reservoir as needed. Then the brake pads made contact and the brake has a perfectly solid feel to it, so no air was trapped inside at all.
Nevertheless being without a back brake for some days was worth it, because now I discovered that I was using it too much and I now think its overuse was a contributing factor on my tank slapper accident (which almost cost me a leg and my life). While braking with the front brakes only I finally felt the same control and confidence on the Raptor as I have with my KTM Duke.
![Rev :revrev:](./images/smilies/revrev.gif)