Adaptive Cruise Control - brakes or throttle? - Subaru Outback - Subaru Outback Forums
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post #1 of 20 (permalink) Old 04-14-2019, 09:00 PM Thread Starter
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Adaptive Cruise Control - brakes or throttle?

An acquaintance on another forum drives a '16 Outback in England. He says the adaptive Cruise Control always uses braking to slow the vehicle when there is a slower vehicle in front. I have minimal experience with this so far, but I assumed it just reduced the throttle setting.

Which is correct - brakes or throttle? Or both?

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post #2 of 20 (permalink) Old 04-14-2019, 09:15 PM
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Both. It'll come to a complete stop if necessary.

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post #3 of 20 (permalink) Old 04-14-2019, 09:44 PM
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Both. Throttle reduction first, followed by service brakes as needed. You can observe brake application on the car symbol in the Multi-Function Display.
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Both. It'll come to a complete stop if necessary.

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Both. Throttle reduction first, followed by service brakes as needed. You can observe brake application on the car symbol in the Multi-Function Display.
Thanks. I'll try to remember to look for the indicators next time.

My friend in England seems to think that it uses only brakes, but apparently he has quite a lot of traffic to contend with, with other drivers cutting in. That would require brakes.
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post #5 of 20 (permalink) Old 04-15-2019, 08:41 AM
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It can also "downshift" the CVT to apply some engine braking. Generally does this for holding speed going downhill.

Also, if it applies the brakes at a "moderate" or greater level, the brake lights come on. So it provides warning to someone following.

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post #6 of 20 (permalink) Old 04-15-2019, 09:17 AM Thread Starter
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It can also "downshift" the CVT to apply some engine braking. Generally does this for holding speed going downhill.
I noticed that. First car I've ever had on which the CC will hold speed going downhill.
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post #7 of 20 (permalink) Old 04-15-2019, 10:13 AM
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It can also "downshift" the CVT to apply some engine braking. Generally does this for holding speed going downhill.

Also, if it applies the brakes at a "moderate" or greater level, the brake lights come on. So it provides warning to someone following.

Mine doesn't do much in the way of engine braking when I'm mountain driving. I have to use the faux gear select on the CVT with EyeSight disabled to engine brake. My Vermont place is in the land of revenue-generating speed traps. It would be very nice if I could use EyeSight to hold speed but it would chew through my brakes quickly.
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post #8 of 20 (permalink) Old 04-15-2019, 12:14 PM
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I have to use the faux gear select on the CVT with EyeSight disabled to engine brake.
I think you mean "ACC" rather than "EyeSight." ACC is just one function provided by the EyeSight system.

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post #9 of 20 (permalink) Old 04-15-2019, 01:04 PM
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Mine doesn't do much in the way of engine braking when I'm mountain driving.
True, gas powered engines don't offer as much engine braking as a diesel with an exhaust brake. But every little bit helps. I'm sure they don't let the RPM climb too high. Mine seems to settle about 2500 max.

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post #10 of 20 (permalink) Old 04-15-2019, 03:01 PM
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I find it annoying, you speed up to pass someone on a 2 lane and in all previous vehicles I have owned you let off the pedal and let the car coast back to the cruise set speed.
Not the outback, it will apply the brakes to get you back to set speed quicker - making you look like a tool for passing someone and then hitting the brakes.

I turn off the cruise before passing now.

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