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      03-12-2023, 01:22 PM   #17
Raimo5
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Drives: BMW 740d xDrive (G11)
Join Date: Feb 2023
Location: Estonia

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Quote:
Originally Posted by Opie55 View Post
BMW says every 2 years and not miles for brake fluid flushes because the reason it needs to be changed is because the fluid absorbs moisture over time, which is not really mileage dependent. It's a fairly cheap service, but you can buy a small tool that reads the moisture content so you can do it as needed and not on a rigid schedule.
These tools are not very reliable. There is a myriad of valves and actuators between brake fluid reservoire and brake pistons, and fluid along that path can be anything but homogenous.

If system is properly sealed and within design operating conditions, then in reality you will hardly feel any difference between fresh and five year old fluid in average driving conditions. The differences might become more pronounced once the child steps on the road behind a parked car and you have to do emergency maneuver with hard braking while hoping for the best. Do you want to find yourself in that situation hoping for best or going into this situation prepared?

Brakes are the most important component of your car. Treat them good and they will treat you good.
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