[vidguy]

Really!!??
Clever solution.. I would have NEVER guessed that...
In what situations will the fluid expand or back up outside of when working on the brakes? Or is that what the engineers were thinking about?

They didn't go to such lengths in the other systems in the car, Power Steering, Auto Transmission, Radiator...ets..

I guess overfilling can have adverse effects in all those situations as well. Maybe it was not practical to do more then put an overfill line or a warning in some cases..

Thanks for the insight!