Sturmey Archer Elite VT drum brake problem

lpretro1

Guest
Have already posted this in the Vintage Section but thought it might be better here. There is only a tiny bit of movement in the actuator arm with the cable disconnected and the brake seems to be binding a little. With cable connected the brake is very stiff when pulled (obviously because there is no movement at the arm) and the brake is very inefficient. Any ideas what may be causing this?
 
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