i had the same problem with the plastic brake line blowing out from fitting
pinch pressure. i found a product from parker hydrolic , it's parker parflex,
nylon tube # nn-4-062, in natural instead of black so you can see air bubbles.
it's rated 500 psi & 200 deg.. it has a.127 wall thickness that will hold all
the compression fitting pressure without leaking or pinching out!
this stuff is flexable & very tough, perfect for brake lines thruout. use
this stuff & forget about brake lines forever,,,,unless you cut it
steve jones,venice fl, n212kr