You are comparing Adaptive Cruise control braking capability with the Emergency braking assist, which are two completely different things.

Emergency braking does not engage until the system determines that you will collide with the object in front unless brakes are applied, so it happens in the last possible moment usually. Although you can set up the distance at which a warning will be shown to you to brake, before the brakes are applied automatically. I often get a warning (mine is set to Middle setting) when someone in front of me brakes suddenly.

 

3008 Manual Page 247

The system is active from about 4 mph (7 km/h) and is deactivated below about 3 mph (5 km/h). It takes account of:
- registered vehicles running in the same
direction or stationary,
- pedestrians present in the traffic lane
(bicycles, motorcycles, animals and objects on the road are not necessarily detected).

I am not sure if this means the brake is released once the speed drops below 3 mph or if it just means that the system is not activated until the speed is above 3 mph. I would hope it is the latter

 

I am not sure if this means the brake is released once the speed drops below 3 mph or if it just means that the system is not activated until the speed is above 3 mph. I would hope it is the latter

It just means that if you are driving at speeds under 3 mph, the system will not react and apply brakes. In the event that brakes are applied it will bring you to a complete stop, and rather quickly though

 

So the problem then is that I'm approaching someone's rear end too slowly?

Seems I always chicken out.

 

I can confirm that emergency braking assist does work. A while back I was following a car, at around 30mph, that I anticipated would enter a roundabout without stopping, but for some reason the driver decided to stop and then proceed straight way. I was in full control and was about to brake but the emergency braking assist took over and brought my car very sharply to a complete stop. Had there been a car following me too closely I am sure the driver would not have stopped in time (unless they also had AEB). In fact there was no need for me to stop at all, so for me, emergency braking assist definitely has a downside.

 

It is even worse if you have a Volvo
I had a rental V40 for a few weeks in France, and a number of times when approaching a parking ramp or a tool ramp (at very slow speed, perhaps not even 5kmh) the system decided to brake for me
Really too sensitive.

But on the other hand, I would always rather have it brake a thousand times for no reason than to hit a pedestrian or a child running in front of the car when I am not looking for a second or two, even at very slow speeds it can be fatal for pedestrians.

 

well you are driving at speeds under 3 mph, the framework won't respond and apply brakes. In the occasion that brakes are connected it will convey you to a total stop

 

If you were doing 3mph and could not anticipate an issue then perhaps you should not be driving

Brake assist is for situations where someone is not paying attention either you or another driver whatever its not going to be needed at low speeds.

 

My issue is that the system doesn't seem to engage at all. I get to within 2-3m when I think it should have engaged, it hasn't. If it gets any closer than that I can't imagine the car stopping quickly enough to avoid a collission. I just want to test that the system does, in fact, work.

 

You have a good point there, but perhaps look at it from the same perspective as you do when it comes to Airbags

We all hope that they work when they are needed, but you never know until they deploy and you never really want them to deploy... a tricky loop

 

When thinking how I could test the auto braking I wondered if a sheet of polystyrene or cardboard stood up in front of the car might work. May need a strip of tin/aluminium foil across it so the radar would 'see' it?

Let us know if you try it

I've had the 'Brake !' warning come up a few times but never noticed it actually attempt to stop

 

I've had the 'Brake !' warning come up a few times but never noticed it actually attempt to stop

Hello,

The way I'm driving, the "Brake!" light comes up almost every day, when I overtake a car and have left a tight space. It has never engaged without a reason, it has engaged once when the car in front of me decided to step on the brake pedal and my car came from 30km to 0km in a flash, and about ~25cm from the car in front.

Don't expect it to engage but only when it's absolutely necessary.

 

Its not the distance that dictates if it will engage its the actual speed difference between the 2 objects the higher the difference the quicker it will react.

So if you were 3m from the car in front which in reality IS to close and that car suddenly brakes the system SHOULD react.

If you are brave you could try driving fast towards something like a hedge

 

Take a look at these YouTube videos -

Here's a video of the automatic braking in action

https://youtu.be/2zg4BNNVDmo

Epic Volvo fails:

https://youtu.be/_47utWAoupo

https://youtu.be/jClxcSBNwcw

 

That first Volvo video.

 

Is radar installed as part of emergency breaking sistem or adaptive cruise control? Im wondering if a car doesnt have adaptive cruise control it means it doeant have radar installed so emergency braking relies on camera?

 

Yes emergency breaking use the camera to detect object. Because of this in my experience, it is very unreliable if the sun is shining on it even lane departure warning/keep assist mess up which also depend on the camera. I'm living in a tropical country and it is a really big issue for me.

 

Yes, the emergency breaking relies on camera. This is from Peugeot 2008:

The radar is only installed (center of lower front grill) with ACC.

 

I hope I am in the right place now.
I have a new 3008 allure automatic. This does not have the ACC option but I am trying to find out what would happen if I came up behind, for example, a car doing 60 and I was doing 70. Would the automatic breaking slow me until I was the right distance and doing at or just below the speed of the car in front. Before anybody asks, I would have had the ACC option but I was persuaded it was unnecessary.

 

I have already answered this Peter, the car will only slow to the speed of the car in front if ACC is fitted as standard.

In your example I am not sure what would happen, the car will either come to a full stop with automatic emergency braking or it will not slow down and go into the back of the car in front. In any event the first option would be dangerous so it is unlikely this would be allowed by the manufacturer.

 

I have already answered this Peter, the car will only slow to the speed of the car in front if ACC is fitted as standard.

In your example I am not sure what would happen, the car will either come to a full stop with automatic emergency breaking or it will not slow down and go into the back of the car in front. In any event the first option would be dangerous so it is unlikely this would be allowed by the manufacturer.

Dautes
Thank you for all your help. I was hoping someone may have been able to reply from experience. Not something I want to test!

 

Nasty