I need to replace my brake fluid I was wondering if when you replace it do you go to each corner and bleed the brakes while adding fluid or do we just empty the tank and refill with brake fluid any help or techniques appreciated

 

For a complete replacement, suck out reservoir, fill, then bleed each corner until you have clean fluid.

 

Get a motive power bleeder.. will pay for itself with one use vs. at a shop. They don't list the Discovery 5 on the website, but ther 1100 european style adapter cap fits my 2019 Disco 5 SE V6 Gas just fine.
IIRC the calipers have 2 bleed screws each.