Brake pads replacement

When replacing brake pads, do i need to open the brake fluid reservoir to ensure it doesn't overflow when compressing the calipers, or open the brake lines to drain the fluid (the bleed) rather than have the old brake fluid push back to the ABS module?

I want to ensure there is no damage to the ABS when compressing the calipers.

i noticed a few youtube clips where the front and rear calipers are just compressed without worrying about anything else.
Rears - https://www.youtube.com/watch?v=QH8sTo8Zem8
Fronts - https://www.youtube.com/watch?v=NwH1oxbtKyk or https://www.youtube.com/watch?v=jN9MoTMwhHc

I dont know if it will cause an issue, however, if your fluid is old enough to cause concern why don't you just bleed first so you've got clean fluid throughout the system?

You open it so it dsnt allow unnecessary pressure to build up and It could give you a hard time compressing the pistons.

Also like 90% of the fluid lives in the reservoir.

Do the brake pad replacement and start bleed from the rear driver side, than rear passenger side, than front passenger and front driver.

I normally get a pump and stuck out all i can from the reservoir, add new fluid and bleed till clean new fluid runs thru ea line.

If the fluid was like full on black and shit, than I normally bleed few times usually use the whole 1L bottle. Till she blows golden juices.

Thanks guys, will flush out the brake fluid and bleed as well.