Hey, I have noticed my rear brake doesn't appear to be working. Don't know if is pedal mechanism or the brake itself. Pedal mechanism is a rizoma rear set thingy. Plenty of fluid in the reservoir but don't get a hydraulic compression feel only feel the spring. Also, brake light doesn't activate until pedal fully depressed. Other day pedal seemed to rotate downwards while trying to do a hill start and appeared to stay way down until I lifted it up with foot. Since that it doesn't seem to move beyond normal range, but still no brake. Note: I am a complete mechanical gumby. Any ideas of what I should be looking for / testing? Pic below.