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I replaced the PSP with a refurb. Everthing seemed to go fine, but at low speeds the power assit is not working. Any suggestions? are there any sensors involed? any help would good, thanx

'92 LS400

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I don;t think it uses vacume .Atleast on mine it is controlled by a electric solenoid which opens and closes to adjust the pressure. To clean just remove the valve with a screw behind it and wipe down and clean its cavity with brake cleans reinstall with a new gasket if needed and your done.

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