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Low-speed steering on this RV causes a loud squeal, presumably a slipping belt. I am trying to find check the level of the power steering fluid. I found this unmarked reservoir in the forward compartment (in front of the engine).

(click for full size)
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The cap doesn't help much:

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I have tried to follow the tube coming out of the bottom of the reservoir, and it looks promising, but I'm not certain (it's difficult to trace). I haven't identified a reservoir for the brakes yet, either, so it could be that.

EDIT: I tried again to trace the line coming out of the reservoir. It goes to something that is turned by the motor (presumably the hydraulic pump). From there a line goes to the brake master cylinder, then the steering gear, then back to the pump. This matches what the chassis owner's manual says:

enter image description here

This cap/dipstick drawing looks very similar to the actual cap/dipstick in the reservoir.

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Yes that is the power steering reservoir.

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From your scan, it's really looks like the PS reservoir. If so, please mark Larry's answer as accepted! – Gabriel Mongeon Nov 29 '11 at 17:03

Yes, it is your PS Fluid reservoir. Brake Fluid Reservoirs do not have the dipstick type of cap you have displayed!

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