OK, I have an older MTB with what I assume are V-Brakes. I mean the cable attaches to both arms directly and pulls from the center. On my Trek Hybrid I have a similiar system, but the arms are longer and the cable goes through an elbow and pulls from the side. Are these cantilever brakes. Also, can I swap the first type for the second with existing bosses? At first glance it looks like I'd get better stopping power with the second set-up, and it shouldn't be hard to change. Any thought? I searched, but am still confused.