I've heard and seen of some heat sink mounting on the rear caliper. Some do themselves and this guy has a little business.. plus another cooler... This is just an introduction just to start. There are options of increasing the brake fluid volume .. crf's only has a brake cooler and gasgas has one on some of their special edition bikes.. and of course there's ebay with some versions of coolers. https://www.facebook.com/1557454477...5745447773379/705278789486706/?type=3&theater Of course there is still the high temp brake fluids too.. motul makes one.