I've heard that coaster brakes can reach high temperatures, so it desirable to use grease designed for high temperature applications. My questions are:
- Would a grease labeled max 220 °C be good enough? Or it can get much hotter?
- What happens if the grease is not good enough? Will it liquefy and drip out of the hub?
- How should you use the brake when going downhill to avoid overheating? Is it better to use it in short bursts, or continuous but not very hard braking?
- How hot can it get exactly? A chart showing the heating and cool down rates would be interesting, but I don't think anybody has done the experiment, it's hard to stick a thermometer in the hub (maybe doable with a temperature camera sensor?).