[Prefferle]

Originally Posted by HPsauce

I don't know how a D3 works, but the operation of the switch you describe is EXACTLY how it works on a D2, with a very slight gap between the two circuits.

IIRC, in a D2, one is for the brake lights, the other for the ECU.

I suspect the only real difference between the two switches is that yours is the later design with the automatic setting procedure which you have followed.
The D2 version is adjustable on a screw thread, no automatic/ratchet setting to worry about.

Thanks HP,

Could you let me know if the switch changes state with the slightest touch of the brake pedal? Or do you get a Slight bit of travel before? I’m already stumped for what this issue can be.
Update: I’ve just metered the old switch and it works electrically fine... it must either be a writing break or something else?... it’s an intermittent problem with many miles covered and many applications of braking before the fault is detected. why is it never easy and straightforward with this car😩