When you had your brake fluid bled 2.7k miles ago, im guessing you had someone manually pumped the brake pedal during a bleed and they over extended the typical pedal travel and that caused damage to the brake booster and or master cylinder

 

It’s a good guess. But unfortunately it was me who bled it and I did a gravity bleed.

Even the last time I bled it with a 2 person, I made sure not to go too low for this reason. But still could be a failing master