Adaptive Cruise Control

The Emergency braking, "will not prevent a collision however only lessen the impact" However on a side note, bumper to bumper, ensuring the car has a good lock it will stop for you, however won't start driving till you barley touch the gas. The car has prevented me from crashing into a trash can, where it stopped and even set the parking brake, also my dads car in his garage, however when I park in there I have to pull up directly behind him, and do a sharp right to get the car in at an angle so it fits. When I did this it did the same thing stopped, and set the brake. It only did that one time when I was actually going a good speed.

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todw said:

I always ASSUMED that the brake lights went on. If they don't, that's a serious hazard.

But on the subject of ACC, it took me a while to get used to. I find that at even the most generous, lane distance setting, the ACC is a more aggressive and jerky driver than me. It waits about 2 seconds longer to start braking than I would do on my own. And toward the end of a stop (because of a stop light and car in front of me, say) it has to really dial down to bring the car to a halt. And then it edges a foot or two closer to the car in front (when coming to a full stop) than I would do on my own.

It's taken a while to trust that it's actually going to get the job done. It just drives more aggressively than I am accustomed to. I pride myself on providing a very smooth, jerk free ride for my passenger wife ... I think out on the interstate for long drives, though, the ACC would be a real dream. Haven't tested that yet.

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Agreed 100%. I hate how it starts up, so if you're in bumper to bumper, and give good distance, it stopped for you, you barley touch the pedal, it like hits low gears and revs high to catch youp real quick. I wish we could set it to drive more efficient.

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Zl700 said:

I had the same thoughts and spent time observing mine. I noticed it first will use engine drag slowing car and then apply the brakes which the brake lights do go on. I observed this against a car following in the dark. However this operation appears to use a lot of the rear brakes for the normal slowing before the harder braking. Evident by the added brake dust on rear wheels after using cruise control. I wonder if the rear brake replacements will be sooner than normal on a average car that typically has a 70/30 use ratio front/rear.

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Heads up there was a recall on the back breaks, at least on my 15 Premium.
NHTSA CAMPAIGN #
14V541000

ACTUALLY HERE IS PART OF THE DESCRIPTION
GM IS RECALLING CERTAIN MODEL YEAR 2013-2015 CADILLAC XTS MODELS MANUFACTURED FEB 14 2012 TO AUG 22 14........ IN AFFECTED VEHICLES THE ELECTRONIC PARKING BRAKE PISTON ACTUATION MAY FULLY NOT RETRACT CAUSING BRAKE PADS TO STAY PARTIALLY ENGAGED.

Could be a reason why your back brakes make more dust than your front.