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I bought a set of DH brake lines and was disappointed to find out that they
were instrument lines made for inside use. they are made of a wound kevlar
which starts to degrade in strength at 150°c. They have a well made but thin
outer core and no protection which looked like it could snap if hit.
aircraft hose on the other hand has a Teflon core with a use temperature of
280°C is covered with steel braid for runway brush and is very tough and
costs the same.  My thoughts are; stick with what was designed for aircraft.
the Aeroquip 666 is the recommended material by the major brake
manufacturers.

Scott