Most power steering pumps have a relief valve set <1000 psig. I expect SLS is similar. Brake hydraulics can reach ~700 psig, depending on how hard you push the pedal, so dbl-flared brake line should be fine.

For those needing to change the SLS rubber hose, there are posts on that. The fittings are re-usable, unscrewing w/ simple wrenches. Ditto for the high-pressure power steering hose.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans