Blew out the high pressure hose on the power steering pump at 235k. In a parking lot but not many vehicles so no collateral damage. Funky fittings look like they are "designed" to blow out. Anyway, check the high pressure hose where it goes into the fitting at the pump. Loose is not good. About $38 from Ford for the replacement and a couple of small bottles of fluid from the local git and go. Nice to be near a dealer when this happens - I wasn't /ubbthreads/images/graemlins/frown.gif
I'm thinking a bigger pressure accumulator of somekind may be in order. The reserve pressure really goes away quick. Leaving minimal directional control and brake capability. Practice E brake operation.
Just a wild guess but I'd bet the pressure relief valve in the pump is partially stuck open. Not allowing enough pressure to build up for the system. The pump provides boost pressure for both the brakes and steering.
You can try flushing the system but if it's ucky - the pumps probably shot. Careful - the pump will run about 750 psi if everythings ok - more or less if it's not. It's a hydraulic pump so an owy is a reality.
I've got a feeling a new pump's in order but if you were to flush do it with regular PS fluid.