Hi and thanks very much for taking the time with this.
I’ve just managed to track down the routes of the vacuum pipes, the construction the RV dash doesn’t make access easy in fact I think access was designed out.
I take the point of tightening things.
It’s my thinking at present that there is some air in the piwer steering system that’s worked it’s way to the HydroBoost. I’m convinced it’s either this or the vacuum theory but the noise doesn’t change when the heating controls are adjusted. It does however vary slightly when the brake is depressed.
The sound is a whirring/whooshing sound. Very front but varies in tone in time with the engine as one would hear from a belt. I have however ruled out belts as the noise is loudest in the footwell area.
Thanks again.
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