[Bimmer Barney]

Haven't been able to pinpoint the answer through search, so maybe direct me or chime in here...

When I brake hard, to the point where ABS is engaged, I immediately get a whine. Car drives fine and brakes fine afterward, but I get a whine that I would attribute to power steering fluid low, or air in the system.

PS Fluid is fresh and bled and at correct level, no leaks.
Brake Fluid is fresh and correct level and bled.

Any ideas? Headed to a track day in the summer and want to make sure brakes and steering are functioning 100%.