Hydraulic brake fluid 5606 will congeal to a thick gooey mess when left
exposed to open air for some time. Don't know if something evaporates or
oxidizes or both. The military does not use 5606 anymore because of that
characteristic. If you are looking for a substitute for 5606, be very
careful regarding seal compatibility, flexible hose compatibility and water
absorption. Boiling point is usually not an issue in KR applications, but
with heavy and repeated brake applications, could be. Steam generated from
the absorbed water in hydraulic brake fluid can produce a gas bubble in the
brake lines and slave cylinders to render braking action nil until things
cool off.
Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA
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Anybody ever have an issue with the red aviation brake fluid gelling in the
lines? It gets as thick as gear oil or thicker so much so that the brakes
are inefficient.Thanks,Kenny N6399U
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