dnorfolk you're brake actuator's may have gone bad. I had one take a shit a few months ago. Do you hear them trying to engage at all? I also was getting a malfunction warning on the dash. I made a thread about it somewhere on here...
I completely replaced both units when I did my brakes a couple of months ago. Bought them for $47/ea off of Amazon. Haven't had an issue since:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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'07 Montego Blue/Saddle Brown E92 335i - 6spd. -
SOLD
'16 Carbon Black Metallic F10 535i M-Sport -
TOTALED 11/21/21 
'13 Black Sapphire Metallic F30 335i M-Sport - unknown charge pipe, MSport Exhaust, 20" 405M wheels, $61k MSRP, CF M4 Mirror caps & Spoiler, NGK plugs, Dinan Coils, BMS intake