Cruise control doesn't work on hills? - Audi Q3 Forum
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post #1 of 40 Old 10-22-2015, 03:40 PM Thread Starter
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Cruise control doesn't work on hills?

Today I had to go down some steep hills while my cruise control was on and noticed that my Q3 didn't brake to maintain the set speed of 62. I had to use the brakes to keep it from just coasting down the hill. I have never had a vehicle do this! Is this the way it is supposed to work? I just have standard cruise control.
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post #2 of 40 Old 10-22-2015, 04:39 PM
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My cruise works as expected.

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post #3 of 40 Old 10-22-2015, 05:15 PM Thread Starter
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My cruise works as expected.
Does "as expected" mean that braking done by cruise control is used to slow the vehicle down or that you the driver used the brakes?
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post #4 of 40 Old 10-22-2015, 06:20 PM Thread Starter
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more on cruise control

I can't believe that a vehicle like this is behind in the "cruise control technology"! I am not some newbie in the world of supposed luxury vehicles. I have driven BMWs and Mercedes for the last 25 yrs at least. Maybe this is just a small thing but I would have liked someone to tell me about it. Our dealer today didn't have any answers and just started talking about adaptive cruise which is an entirely different thing.

I really like this Audi and think it "fits" me perfectly. However I was not happy to discover this today!
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post #5 of 40 Old 10-23-2015, 08:58 AM
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Originally Posted by ShrlyG View Post
..snip I have never had a vehicle do this! Is this the way it is supposed to work? I just have standard cruise control.
NO vehicle I have ever owned applies the brakes on an overrun. None. Maybe late year adaptive cruise does. Typical cruise control would not know of following cars, or if roads were icy or gravel so applying brakes could be dangerous.

What vehicle/year did you own which applied the brakes without adaptive cruise control?

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post #6 of 40 Old 10-23-2015, 11:04 AM Thread Starter
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NO vehicle I have ever owned applies the brakes on an overrun. None. Maybe late year adaptive cruise does. Typical cruise control would not know of following cars, or if roads were icy or gravel so applying brakes could be dangerous.

What vehicle/year did you own which applied the brakes without adaptive cruise control?
My local Audi tech just told us that I possibly need a firmware update. I was traveling on a hilly country road, not coming down the side of a mountain, and my speed should have been maintained. My husband has traveled this stretch of road many times in his Mercedes GLK, with standard cruise, and has not had to apply the brakes. Bottom line is the vehicle should maintain a set speed within a few miles per hour when going down a hill.
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post #7 of 40 Old 10-23-2015, 11:15 AM
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Mercedes does apply brakes on some cars according to a quick Google.
I am guessing it is in their smart cruise models.

All I am saying is that it should not be an expectation that cruise control always applies brakes.
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post #8 of 40 Old 10-23-2015, 01:03 PM
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I used to drive a Jeep Cherokee company car that actually geared-down in an attempt to maintain cruise control speed. The first couple of times it happened to me on the steep and winding California Highway 60 west of Palm Springs it took me totally by surprise....and I didn't like it because it could cause all kinds of problems if conditions were such that I needed the extra speed or higher gear or the road conditions were such that gearing-down would have made it hazardous.

Like most, I was just used to free-wheeling it down the hills while using braking as required....just as I've done in all other cars, including an earlier model Jeep Cherokee.

The Q5 we recently drove through the very steep Siskiyou Mountain Range in southwestern Oregon did not/could not maintain the set speed on the downgrades.....but did great on the climbs.

As for the Q3...haven't tried it. Will attempt to pry the car away from my wife this weekend and find a steep hill....

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post #9 of 40 Old 10-23-2015, 01:43 PM
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Never cruise controlled down a hill before. Let us know how that goes DampDuffer!
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post #10 of 40 Old 10-23-2015, 03:44 PM
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Just to experiment I put my cruise control on 40 on the way to work earlier this week. I was going on a low traffic curving city street with a 35mph speed limit that had a slight uphill section followed by downhill. No issue on the uphill but on the way downhill I was rapidly approaching 50 MPH so I went to the brake. I don't normally think of cruise as something for hilly areas where I'm going to be engaged in the driving experience Freeway driving on a relatively flat stretch of road without too much traffic is a great place for cruise control.....and I found it worked just fine in this scenario, although it did also do well going up a hill. Look forward to DD's report.

John
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