I was driving along happily a couple of days ago when the dash lit up with a brake warning.

 

I was making a short journey so when I arrived, before switching the engine off, I snapped these screen shots.

 

Wasn't really surprised when I switched the engine off and started up again with no dash warning lights.  All seems well.

 

Crossing my fingers that it doesn't become an On/Off intermittent warning.

 

 

 

 

 

Low battery voltage can cause all kinds of weird, temporary (and seemingly unrelated) faults.

Last winter I had a traction control error and the horn wouldn't work. "Turning it off and on again" after a few miles, and both were fine.