S 550 (221.171) V8-5.5L (273.961) (2007)
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Component Identification
Pressure limiting
A pressure limiting valve is installed in the quantity control valve to protect the steering system against overload.
It opens at a pressure between 65 and 125 bar depending on the model of power steering pump. This occurs, for example, at full steering lock, and is
audible as a high-pitched whirring whistle.
