Since the brake pedal went to its full travel, there was probably no significant pressure being developed. But there was no fluid leakage. Two possible causes are:
1. Water contamination of the brake fluid causing vapor to form at elevated temperature in the brake caliper. You say you changed the fluid 1400 miles ago but don't mention how many months ago that was. Normally changing brake fluid annually is enough to avoid excessive moisture build-up, but that assumes that the brake fluid comes from a sealed container.
2. A piece of grit present in the master cylinder could have temporarily caused the master cylinder to malfunction. This is a real stretch, but not impossible.
I'd bet on the brake fluid being contaminated with water. Here's an article on the subject:
http://www.epicbleedsolutions.com/resources/faq/dry-and-wet-boiling-points-dot-brake-fluid/HTH,
Mike Martin
[b]From:[/b] "gerryponline@... [DSN_KLR650]" DSN_KLR650@yahoogroups.com>
[b]To:[/b]
DSN_KLR650@yahoogroups.com
[b]Sent:[/b] Wednesday, July 6, 2016 7:05 PM
[b]Subject:[/b] [DSN_KLR650] Brakes, No Brakes, Brakes
About a month ago, I was following a friend uphill on a very curvy road, requiring lots of braking and accelerating. We had gone about 4 miles when I suddenly had no rear brake. I pulled off the road to investigate. The brake pedal could move through it's entire travel with virtually no resistance. The master cylinder was still full, there were no signs of leakage anywhere. It took 5 - 10 minutes for my friend to return to where I was stopped. When I tried to demonstrate the problem to him, the brake felt normal again. I rode the 8 +/- miles back home, repeatedly using the rear brake to try to get the problem to repeat itself, it never did. I don't get it. I have not ridden the bike since then.
I'd sure like to make sure this doesn't happen again. I'd appreciate any answers, theories or even wild guesses as to what could have caused this, and possible solutions.
The bike is an '04 with 20,118 miles on it. I changed the brake fluid (DOT 4) 1,400 miles ago. Until this one occurrence, the brakes felt good and solid, as they should.
Thanks in advance for any replies.
Gerry
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