Maybe it's a daft thought, but why doesn't anyone make a brake fluid cooler? You know, something with fins on to dissipate the heat and keep expansion down? I'm sure it could be done in quite a small space...
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball