Thanks, for advice i will consider it doing next time

Yeah this guy is driving me insane with the environmental issues.

Start from the rear side first cos brake line are coming from the front. Try drain 1 litre from all tyres. 65% from the rear and 35% from font.

It is recommended by the specialist to change it every often but not necessarily to be replaced.

On normal braking around city or motorway driving you wont notice the brake fluid boiling. If you were on a spirited drive say countryside or mountain pass if your brake fluid has water content you will make the brake pedal sink to the ground with little or no brakes more noticeable downhill. Not to mention other issues like seized calipers/ABS pump causing a problem long term. It costs less than £20-30 for a DIY brake fluid change dont chance it. Its well worth getting it changed.

10 y / 100k miles interval is enough for hybrid car just like Tesla. It depends on how much % water.

The brake fluid needs to be changed regularly. (At least tested every year and depending on the moisture level changed). I usually change it every 2/3 years.

On most of my vehicles in the past 40 years, I never bothered changing brake fluid, but when I started to do it I noticed the difference: brakes become really more responsive. It simply can make the difference in case of emergency. 😉 I decided to flush brake fluid on a regular basis when the car I had then had its brakes pipes burst because of corrosion! It was 20year old and made 200000Km so it's hard to say if changing brakes fluid regularly would have changed anything but if you do it by yourself it doesn't cost much, so why not do it?

Old fluid will remain in the brake lines it my slow down the corrosion and rust.

1 to 1.5 litre. Mostly 1 litre will do the job. More peace of mind drain the rear more will take half litre more

Thank you, sir

Yes I agree I did that later on

What do you mean? What calibration do you need to do?