As an observation, if you center the switch operating mechanism (in the non operated position) before installing the switch assembly it will remain centered if you bleed the system using a hand vacuum pump or a pressure bleeder attachment on the MC reservoir. The pressure differentials with vacuum or pressure bleeding are small compared to the hydraulic system operating pressure and will not operate the switch. At least it has never operated the switch on my 142. If you bleed the system using the pedal pump method then the operating mechanism will not remain centered during the bleed process.
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