gobi said:
Mr Yellow is from 1988, I was intending to replace the cantilever brakes with v-brakes, Do it or leave it as is? it brake fine with what is on it now.
If you have all the braking power you can use, why bother meddling with it? If you don't, I suggest changing to fresh high quality brake pads (like Kool Stop) before you switch brakes.
V-brakes can always be mounted on cantilever posts, but the cable routing differs and might become a little kludgy if you switch. Also, linear pull brakes like V-brakes use levers with a longer pull ratio, so you'll have to swap those as well.
Cantilevers are the most tunable of all brakes, so it's worth giving them a go.
https://www.sheldonbrown.com/canti-trad.html