Went riding on my '06 Sprint ST yesterday. I applied the rear brakes, brake pedal went down 90 degrees and no rear brakes! Pulled over and the rear brake line where it goes into the banjo bolt on the caliper was leaking, leaking brake fluid all over everything. I obviously need a new brake line, but is it possible there is a problem in the master cylinder also? I may take it apart tomorrow to check it out, but does anyone sell a rear master cylinder rebuild kit?