I have a Specialized Camber Comp 26er with Tektro Draco disc brakes. I've got about 600 miles on the bike and starting about a 2 weeks ago my rear brake lever has gone completely soft. It wasn's a gradual change, but ovenight. My front brake works fine, just very noisy.
The rear brake lever is soft and goes all the way to the grip before the rear brakes work. I cleaned the rotor and pads with auto brake cleaner, recentered the caliper on the rotor and that didn't help. I took the wheel off and visually inspected the brake pads. One of the pads is like new and the other is about 50% worn. I verified that the piston on the unworn side works by pushing the other pad in and squeezing the lever. The piston on the unworn pad extends, so its not jammed. Should I take it to the LBS and have the rear bled or is there something else going on here?
Thanks in advance
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