I come from BMW world where we had our share of ridiculous OEM parts prices but Audi it seems is even worse.
I'm very new here and I'm not sure if this was discovered already but here it is:
This hose fits perfect other than being longer about 5" which you obviously match to old hose length and cut.
ID is spot on, 100 psi pressure rating and designed for this application.
I cut the old hose off and transferred the OEM flow restrictor and flushed the system with Febi mineral hydraulic fluid. I've used the simple method:
Empty the reservoir, plug return line opening, fill it with fresh fluid, run the engine about 4 seconds while return hose is routed in clear gallon jug, repeat twice, reattach return line back to reservoir, fill the reservoir for third time, run the engine and turn steering full left and right to get rid of any air in the system.
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