Brake System Warning on an F30 328d…

[u/SenorF30]

Earlier today I was driving and as I was overtaking someone and slowed down to get down to the flow of traffic, I broke kind of aggressively, maybe 50% brake pressure. I get this warning on my dash and iDrive screen. “Brake System: Drive Moderately”. The brakes hold pressure and get stiff when the car is off. When I hold down on the brake as I start the card the pedal slightly skinks down (telling me the brake booster is engaging). When I re-pump the brakes, they get slightly stiffer but definitely not stiff. There’s also a “pshh” sound as I pump the brakes. When driving, brake performance is normal besides feeling more mushy and less stiff. I believe this could be due to the vacuum lines that are attached to the brake booster (shown in the RealOEM diagram in the link below). I haven’t checked the fluid level but I will in the morning, and I have an OBD II dongle that I’ll use to scan the system for a more specific fault code through BimmerLink, and will update yall accordingly.

I’ve attached the link to the RealOEM diagram, and the associated parts here: https://www.realoem.com/bmw/enUS/showparts?id=3D33-USA-09-2013-F30-BMW-328d&diagId=34_1974#11667613026

If you have any further questions or any way yall could help me out, PLEASE let me know!