This is driving me nuts.
The bike is a year old. Cantilevers with 105 levers and in-line brake levers. I run Jagwire housing with Delta teflon coated cables. I use the same housing and cables on my road and MTB with excellent-- super smooth and light-- performance. I don't grease any of my cables-- it's never seemed to help and has only attracted dirt.
The drag on the rear brake cable seems to have increased over the last few months. The cables and housing are all less than 6 months old.
The rear cable stop was integrated with the seatpost collar and forced the cable to exit at an angle. The teflon was wearing off the cable so that was a dead giveaway for friction. I've replaced that weirdly designed unit with a conventional collar and cable hanger. Response is a little better. At least the lever returns to it's stop rather and being overcome with friction and leaving a couple of mm's of play.
But WTH?? Why is this "suddenly" so terrible? I'm having to run the spring tension on the cantilevers almost to maximum. This overcomes the drag but gives a really stiff feel at the brake lever.
I'm going to have to pull everything apart up to the lever I suppose. Maybe dirt/mud contamination at the lever? Something gotten down in the cable housing?
Any tips? Suggestions? Wisdom?