I just do a visual check every engine oil change along with other checks, I take mine down to just above minium and always get spares so I always have a spare front and back in stock. that's 6 pads for my RK.
Look in our suppliers section before buying, there has been a couple of threads lately on pads.
Before you start make sure you have the correct tools
Socket size for brake pad pins and front Caliper retaining bolts