Last night I repaired the front brake on my single speed. If I pulled the lever the caliper would go in but then wouldn't return to fully open. And it felt terrible like metal grinding on metal. It started to do that on the SpokeFest ride at the end of last summer. Instead of fixing it, I just quit riding it and switched to my regular road bike, but now I've been wanting to ride it again. I hardly ever have to do anything to my bikes, but now and then you have to fix something. Usually a tire.
So I bought a new housing and cable thinking that would be the easiest fix. I had ruled out the caliper and the lever. It ended up being the cable housing. It's working fine now and I rode the single speed to work.