Corolla down-shifts when braking downhill

2006 Corolla, when it's downhill and I press the brake pedal above a certain braking power, it shifts down the transmission. I was trying to figure out if that's a feature of the transmission and how does it know that the car is travelling downhill. It's probably intended for adding engine braking but sometimes it's just annoying since revs go up and it strains the engine and transmission. BTW, no down shifting when braking on a level road.
Reply to
Dan
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Yes, the downshifting is a feature off the transmission. The car doesn't know that it is travelling downhill, but it does know that the vehicle speed is not dropping relative to engine RPM so it downshifts.

Reply to
Ray O

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