Yesterday when I looked into designing of my uprated sway-bar links, I used the opportunity while the front left wheel was removed to check my drum brakes. Apart from being dusty and dirty they don't show much sign of being used. Usually two years of trackdays and fast road use would wear a set of disc brake pads down. But compare the above picture from when the linings were all new ... with the picture below from yesterday. It's almost as if they haven't been used at all!
You can also see that the ventilation holes around the periphery of the big aluminium drums have seen a lot of dust. It looks really dramatic with patterns of speed and hard use. I love the colors. It is evident that the brakes have most certainly been used - I do like the look of freshly refurbished mechanics, but the patina of equipment is also wonderful.