BMW 8 Series Brake Warning Lights, Switch Issue?

Hey there! I had a pretty similar issue with my 2018 BMW 7 Series diesel last year (I'm fairly new to car maintenance, just basic experience). Got those same warning lights and error messages, totally freaked me out at first! Turned out I hadn't fully released the parking brake, just needed to press the brake pedal firmly and properly disengage it. The warnings cleared instantly. Felt a bit silly when my mechanic showed me that! Before sharing more specific advice though, could you share: Does this happen when starting the car or while driving? Are you using the electronic or manual parking brake? Have you checked if your parking brake is fully disengaged? The 8 Series has some differences from my 7, so these details would help me give you better guidance.

Thanks for your reply! I should mention mine has 129138 KM on the clock and had its last service about 3 months ago. The issue actually happens out of nowhere while driving, not just at startup. I've checked the parking brake thoroughly, it disengages properly and I can even hear the motor working. The warning lights just pop up unexpectedly, sometimes lasting a few minutes before clearing themselves. Really annoying as it keeps coming back. I've tried the basic pedal press and release multiple times but no luck fixing it. Your experience sounds way more straightforward than what I'm dealing with!

Ah right, now I see what you mean! Yeah, my situation turned out to be much simpler than what you're experiencing. After that first parking brake incident I mentioned, I actually started having unusual warning light issues too, pretty similar to what you're describing. Mine was around the 115000 KM mark. In my case, it ended up being a faulty brake light switch after all, exactly what you initially suspected! The weird thing was how intermittent it was, just like yours. The warnings would pop up out of nowhere while driving and then clear themselves, which made it super frustrating to diagnose. I held off going to the shop at first, thinking it might sort itself out, but the frequency of these warnings just kept increasing. When I finally got it checked, the mechanic found that the switch was wearing out internally, something about the contacts getting unreliable. The replacement only took about an hour and wasn't too expensive. Since the fix, I haven't had a single warning light come on. If your symptoms are matching what I experienced, unusual warnings while driving, self-clearing, and recurring, I'd put money on it being the same issue. Might be worth getting that switch checked out sooner rather than later.

Thanks so much for sharing that detailed experience! That's incredibly helpful and sounds exactly like what I'm going through. The intermittent nature of the problem was really throwing me off, but hearing that you had the same symptoms and it turned out to be the brake light switch gives me confidence about what to tell the mechanic. You're right about getting it checked sooner rather than later, I'll book it in this week. Really glad I asked here first, as I was starting to worry it might be something much more serious or expensive. Having to deal with unusual warning lights popping up while driving is pretty nerve-wracking, so I'll be relieved to get this sorted. Really appreciate you taking the time to share your experience in such detail! I'll update the thread once I get it fixed in case anyone else runs into similar issues with their 8 Series. Thanks again for the help!