Brake warning light

[donrs4]

We are onto sth here it seems. I have had exactly this problem 3x in the past ten days.
- read brake warning on the display, incl. sound
- occurs only at engine startup, never afterwards
- happened now in winter. Occurred to me it happened also last winter

However, it is probably NOT the cold, as mine happened both in my underground parking garage at home (is around 5°C now although outside goes below -5C at night), and at work (is around 15°C all year round).

I think I need to let it complete the diagnostics and wait till the yellow OK sign comes on before starting the engine. This is the only thing I can think off as I certainly on 2 occasions of the 3 just got in and started the engine. Will keep you posted
d.