elliotf wrote:This is a problem with high altitude and overheating brakes. This is out of a BMW manual:
"Serious Considerations – As stated before, boiling temperature increases as pressure is applied. If the brake fluid in your BMW motorcycle has enough water in it to boil at normal air pressure (1atm at sea level, less here in Salt Lake City!), and if you use your brakes aggressively, you may generate enough heat to exceed the wet boiling point. The brake system pressure may make the boiling point high enough to stop the boiling. But, when you release the brake lever, the pressure goes back down to about 1 atm. At that pressure the brake fluid could begin to boil. Then the next time you try to apply the brake, the boiling fluid will cause you not to have any brakes! This could really be a problem, particularly if you are coming down a mountain pass at high speeds with a full load and a passenger and need to slow down for that next turn!! We cannot emphasize too strongly the importance of flushing your brake fluid annually."
Dwight wrote:Hey Doug,
I've been told that the best technique to use on long downgrades is to keep it in the lower gears and don't break in small, gentle amounts. Instead, grab a real handful of brake to slow down a lot, quickly -- and then let loose so the brakes can cool down some before you grab the next handful.
doug wrote:The problem I faced both times I experienced the failures...was that I had a long line of cagers in front and behind me dictating the speed of the descent, which was significantly slower than I would normally go.
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