What's this warning symbol for?

[dfyoung10]

2010 E90: I had a SES light come on today, and when I went to reset it, this icon came up. I've got access to a OBDII analyzer tomorrow, but wondered in the meantime what this might mean. Looks like attention needed on some fluid, but no other lights are on the dash. I looked at dozens of sites showing various BMW
dashboard icons, but none matched this one. Maybe the water is low in my tires. Thanks.

20221119_121238.jpg

[Cattlecar]

brake fluid level

[dfyoung10]

Hey, thanks!

[zellamay]

Save this: https://www.bmwofmiddleburgheights.c...tor-lights.htm

[JDStrickland]

Brake Fluid. This will not trigger the Check Engine (SERVICE ENGINE SOON) Light. Your OBD II scan tool will not tell you anything with regards to this indicator.