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From: Dan on 15 Jul 2010 01:33
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.
From: Ray O on 16 Jul 2010 01:10

"Dan" <drnwnr(a)hotmail.com> wrote in message
news:002022d8-b909-471b-a941-ca508b62ffbe(a)y11g2000yqm.googlegroups.com...
> 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.

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.
--

Ray O
(correct punctuation to reply)


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