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[TheBoy]

The CHECK light you are seeing - which should show until first brake press - proves the main brake light switch isn't working.  Now this is most likely to be the switch itself, but could be damaged wiring obviously.

[Valentin]

Hello everyone !

Finally received the new switch, needed to be 2 persons to remove the old one without destroying it > press the brake the most you can, slide the red cylinder out to the maximum, disengage the 2 side hooks and it's free.

The new switch works perfectly, the brake lights and CRC finally react as they should.

I tried to understand why the old one was faulty, and I think it's pretty simple. When new, the switch rod (grey) is fully extracted. When the pedal pushes the rod the first time on uplift position, it slides in and set the uplift position by default. Inside there are several "clic" positions and each of them is a starting point for the internal actuator to switch on and off. I guess it's to be compatible with several pedal positions on the different cars it's fitted. On the old one, this starting point was broken inside, but there is no way to see it from outside. Thus, the pedal needed to be pressed very hard for the switch to eventually work on another starting point.

Here is a picture of the original part

[TheBoy]

Glad its resolved, and thanks for posting your findings on the old one