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Old 12-03-2017, 10:20 PM   #1
Drives: 2007 Yaris
Join Date: Dec 2017
Location: Northeast US
Posts: 3
Sounds like Yaris downshifts when I brake going down a hill?

Hi there fellow Yaris owners! I have been driving my automatic 2007 Yaris for just a couple of months. It has 140k miles and previous owner took very good care of it.

Lately I've been driving a very hilly route to work and I've noticed that when I'm going fast (~50 mph) down a hill, when I put on the brakes, the car sounds like it downshifts to a lower gear. It just makes a sound like the engine is revving, and it keeps making the sound after I take my foot off the brakes. It will continue for maybe 10 seconds while I'm coasting downhill and then it sounds like it upshifts and the noise stops. This always happens consistently when I brake while going down a big hill.

I've heard of people downshifting while going downhill in a manual car so that you don't have to apply the brakes as much. I'm wondering if the Yaris does this automatically somehow? Does anyone have any idea what else might be causing this noise?

Thanks in advance!!
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Old 12-03-2017, 10:53 PM   #2
Kaotic Lazagna
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Drives: '14 GT86, '08 Vitz
Join Date: Dec 2006
Location: Central Valley, CA
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Yeah, automatics will downshift into a gear it thinks will help slow down the car by engine braking. I've only ever had that happen in steep downhill grades tho (in rental cars).
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Old 12-04-2017, 11:49 AM   #3
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Drives: 07 Yaris Sedan Aero
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Location: Brossard, QC
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Braking on a downhill will cause the automatic transmission to downshift. Has been the case for a few cars I've driven.

Mazda 3/5, 2002 civic, Toyota Echo...

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Old 12-04-2017, 02:52 PM   #4
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Drives: 2014 Yaris SE
Join Date: Apr 2014
Location: NYC
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Yeah, what you describe is exactly what's happening.
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Old 12-05-2017, 01:22 AM   #5
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Drives: 2013 NCP130
Join Date: Nov 2015
Location: Sydney, Australia
Posts: 312
The same will also happen downhill if you are using cruise control.
Running on standard AU 14" steel wheels (14x5 rims, 175/70R14 tyres). Added reversing camera and touch screen radio, cruise control, 16" rear wiper blade, tow bar and dash cam.
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Old 12-05-2017, 09:30 PM   #6
Drives: 06 2ZR Turbo Yaris RS
Join Date: Aug 2017
Location: Beaver Harbour, New Brunswick, Canada
Posts: 2,360
Can confirm what the others say. Both my Yari do that.

2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer
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brakes, hill, noise, transmission

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