OP, when you bled the brakes, did you starve the reservoir of brake fluid at all?

ive read that some cars equipped with ABS need to have the reservoir topped off at all times while doing a bleed job so you dont get any air in the ABS unit. if you dont do this, air gets in the ABS unit and it now has to be bled. from what i understand, its generally harder to bleed those rather than all 4 corners.

someone please correct me if im wrong, but id like to learn as much as i can about these issues (this isnt the first time ive seen a thread like this regarding the TBU). i plan to do this upgrade some point down the line.