I havent noticed this before.

 

I have ordinary cruise control, not acc.

 

I have some speed set (feet of the pedals). If I go upwards, it keeps the set speed, however if I go downwards, it doesnt brake enough and the car just keep increasing speed, and soon it gets well over set cruise control speed.

 

Have I got a cruise control fault?

Edited 25 August, 201510 yr by toni8b

Nope, standard cc does not brake for you unfortunately

Hi Toni, sorry but do you mean up or down hill?

 

So when you go down hill the car is 'running' away and exceeding the 'set speed'?

Hi Toni, sorry but do you mean up or down hill?

 

So when you go down hill the car is 'running' away and exceeding the 'set speed'?

Yes, exceeding speed downhill.

Normal behaviour for standard cruise. It has no interaction with the brakes, it will just stop fuelling the engine if you are above the set speed, so downhill you are relying on engine braking only. Depending which gear you are in at the time will dictate if you increase in speed.

All cars Ive had with regular CC have behaved like that.

So andyvee's explanation is spot on.

So nothing is wrong with your CC toni8b.

Ok, thanks guys!

 

Partially happy I dont have to visit the stealer, but again not happy because I cant rely on cc keeping the speed in all circumstances and preventing me from getting the fine. Must go for acc next time.

Ok, thanks guys!

Partially happy I dont have to visit the stealer, but again not happy because I cant rely on cc keeping the speed in all circumstances and preventing me from getting the fine. Must go for acc next time.

Does the car have speed limiter in addition to cruise control? I use that on my current car when going through roadworks with avg speed cameras. That said, it still doesn't brake if you're heading downhill.

Not sure, I am not familiar with that option. Must say I never heard of it.

Ok, thanks guys!

 

Partially happy I dont have to visit the stealer, but again not happy because I cant rely on cc keeping the speed in all circumstances and preventing me from getting the fine. Must go for acc next time.

I'm not sure ACC, will apply brakes when going downhill. My understanding was that it reacted to cars in front going slower than your selected speed, and consequently reducing your speed to match.

Then when vehicle in front increases speed your car will do the same - up to the set speed.

The only way I can see it controlling your speed downhill is if there is a car in front going slower.

I'm not sure ACC, will apply brakes when going downhill. My understanding was that it reacted to cars in front going slower than your selected speed, and consequently reducing your speed to match.

Then when vehicle in front increases speed your car will do the same - up to the set speed.

The only way I can see it controlling your speed downhill is if there is a car in front going slower.

ACC does brake downhill. It will not go faster than the speed you have set.

I use it all the time in an undersea tunnel with speedcams that measures the average speed between two cams.

Does the car have speed limiter in addition to cruise control? I use that on my current car when going through roadworks with avg speed cameras. That said, it still doesn't brake if you're heading downhill.

There's a speed warning option on the Maxidot. It won't brake for you, but you could set it to 1mph faster than the CC speed so at least you'd get a warning when you need to brake.

There's also a winter tyre speed option on the infotainment. I'm not sure how this differs from the Maxidot speed limit. I've not yet tried to use either of them.

Edited 26 August, 201510 yr by Rodge

The winter tyre speed option works just like the Maxidot speed limit - it notifies you that you're overspeeding. So you can actually set two warnings.