Hi,

I have a problem with my rear mechanical disc brakes on my hybrid bike. Every time I press the brakes, it works, but the cable doesn't seem to retract to its original position and remains squeezing the disc brakes even though I release the brake level. I'd have to manually pull the caliper back to its original position to stop braking. Would this be a cable issue? I have never lubed my cable since I got my bike (had it for 6 months and practically used it everyday biking in the rain and snow).

One thing I notice, when I bring it indoors, the rear brakes work fine. Outside is -7˚C.

Summary:
1. Squeeze and hold on rear brake lever
2. It is a little stiff and difficult pulling the lever
3. Rear braking occurs
4. Release brake lever
5. Brakes still remain braking on the disc brakes (rear brake cable not relaxing)
6. Have to manually pull the rear brake caliper to release cable tension and stop brakes from squeezing

Any tips on how to fix this problem?

Thanks!