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Wait I never knew that you could overheat and fail if you rode it down the mountain. Holy shit
Yep, you want to do engine braking. That's when you downshift and the engine slows the car. Even with an automatic transmission, you can downshift to 2nd so long as you're under 50mph or so. You want to be slower than 20 before shifting down to 1st gear.
If you ever have a chance to drive up Pikes Peak in Colorado, 1) it's gorgeous and 2) they have a stop halfway down where park rangers will check your brake temps with an IR thermometer. If you're too hot, they make you sit there in your car for a while for the brakes to cool off and they give you tips on engine braking. Lots of flatlanders driving in the mountains for the first time and learning lessons the hard way.
My wife's family did that once and the ranger was apperently shocked at how cold the breaks were from very effective downshifting
If I were a ranger at those stops, I would totally turn it into a game based on make and model, which state they're from, and judging the driver.
"Soccer minivan from Illinois? They will have no clue how to drive in mountains, their brakes will be hot"
"Ice cold, dude, I'm up by three, next Coke is on you"