Hi Joe,

Maybe a better way of putting it is the switch is not supposed to be part of the hydraulics. And as far as pressure in concerned, it isn't, but what can leak beyond the hydraulic seals will contaminate the switch.

But yes, if I had to replace the entire octopus, I'd expect to run a liter of fluid through the lines.

If your symptom is just a weak glow, seeming to vary with weather, etc., you can check the switch with an ohmmeter and find it tens or hundreds of ohms that goes away when you clean the crud out. The switch doesn't go "bad", just gets filthy. On the other hand, if it comes on strong, and measures less than a few ohms, the problem is hydraulic, and the switch is doing its job.

See this old conversation for more Leaking brake failure switch fix...maybe


--
Art Benstein near Baltimore

If lawyers are disbarred and clergymen defrocked, doesn't it follow that electricians can be delighted, musicians denoted, cowboys deranged, models deposed, tree surgeons debarked, and dry cleaners depressed?