Does Cruise Control use brakes for slowing down?
03-23-2011, 11:34 AM
#2
Depends. If you hold the stalk down it will start dropping MPH in large increments and then yes, it uses the brakes. Just giving it a tap down an MPH or 3 though won't use them.
03-23-2011, 12:16 PM
#3
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Won't it also use them if you start to pick up speed while going downhill? Feels like it anyway....
03-23-2011, 12:43 PM
#4
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I've noticed something happening on our '06 A6 when going down a long hill with the cruise engaged. I can hear a noise (almost sounds like the ABS pump firing) and then the car begins to slow just a bit. I've experienced it more than once, something is happening in the background, I'm not certain what it is.
I know our previous MBz wagon would actually downshift one or two gears when the car was in over-run and picking up too much speed. I really dis-liked that design. I ended up turning off the cruise control if I could see I was approaching a long downhill section.
I know our previous MBz wagon would actually downshift one or two gears when the car was in over-run and picking up too much speed. I really dis-liked that design. I ended up turning off the cruise control if I could see I was approaching a long downhill section.
03-23-2011, 12:50 PM
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03-23-2011, 11:45 PM
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Why do you dis-like this? It is the correct way to maintain a low speed, whether in an automatic or manual.
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03-24-2011, 04:08 AM
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03-24-2011, 05:39 AM
#9
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Yes, but the car cannot tell how far a hill will go, if there are perhaps curves coming up where it might be dangerous to assume it can go faster than it was set to, etc. It's a car, not a subsitute for a person, so they program it to do the best they can with the availible tech.
03-25-2011, 05:02 AM
#10
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I guess the primary reason was the car was still new to us and the downshift (5 to 4) was quite harsh. In all seriousness, I thought the trans was ready to fail. Then it shifted from 4 to 3 and I was really concerned as I had never witnessed this on any car before. It just wasn't natural. I saw it do it again and again during the time we had that car when traveling on the highway on a fairly steep downgrade. I got into the habit of switching the CC off when I could see it coming.
Also, as blackhawk mentions, it's a waste of energy when the car tries to slow itself.
I wonder if the Germans have something in their regs that mandates this sort of behavior when the car is on cruise ??
xx km/h over set speed = apply brakes
