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Reply to "Brake Warning Light"

Seems to me that if differential pressure moved the shuttle and the switch made contact, opposite differential pressure will move it back, not just jamming the pedal as hard as you can. Where's the differential then?

If it's gummed up with varnish and stuck, that's another thing. One last check would be to pull off the wire. The light should go out and you'll know you're on the right track anyway.

I looked at my '74 wiring diagram and it's clear that a different light is lit by the pad wear sensors. However, your E-brake warning light is the same light as the one illuminated by the differential switch, are you sure your handle is all the way down?
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