[tsomctl]

> and a software patch that lets a driver know if their brake fluid reservoir is running low.

You mean like every single other vehicle ever made? I thought this was a law. Also, if all it takes is a software patch, then that means there already a fluid level switch in the reservoir. Unless they are doing some magic computation that measures the brake fluid pressure and the brake pedal position that's able to detect air bubbles in the line. Modern ABS controllers are already doing a full physics simulation of the hydraulic brake circuits, so it's possible.

[sweuder]

Maybe on higher end or newer vehicles sure, but for your standard economy vehicle made in the last 2 decades its commonly just visually reading (as in a human just looking with their eyeballs) the fluid level on the reservoir. No sensors or switches involved.

(Obviously not relevant to ferrari)

[mikestew]

That hasn’t been true in the U. S. for a good 50 years. Cars going back to the 60s had a small float switch that flipped a dashboard light if the fluid got low. As one who used to work on cars as a profession, I don’t recall that I’ve ever seen a car without this simple warning device.

The reason parent commenter doesn’t know this is because hydraulic leaks on auto brake systems are relatively rare as long as the vehicle darkens the door of a shop occasionally, even if rarely. Ergo, one might not even know there is a dash light.

[sokoloff]

Every car I've worked on over the last 3 decades has a brake fluid level sensor (usually just a go/no-go float switch).

https://www.youtube.com/watch?v=jsGZJFMgUpA has a quick view to it on a random car in the first 11 seconds of the video.

(Something very much like) This is required by 49 CFR §571.135.S5.5

https://www.law.cornell.edu/cfr/text/49/571.135

[kube-system]

My Honda Civic had one 30 years ago.. a quick search for that part shows that it interchanges back to a 1980 Civic too.

[tsomctl]

Visually? Really? Didn't know that. I only own and work on old vehicles, and those all have a float with a magnet that triggers a reed switch.

[throwaway0a5e]

Every car back into at least the 1980s has had an fluid level indicator switch and a light on the dash.

[raverbashing]

It probably means "a new software release tuned to the new brake fluid cap conditions"