Is there a way to test the Collision Prevention feature without risk?
Thread Starter
Member
Joined: Sep 2017
Posts: 174
Likes: 36
From: Central Oregon USA
2017 C300 Cab 4Matic
Is there a way to test the Collision Prevention feature without risk?
My 2017 C300 is the first car I've had with a collision prevention feature. I'd like to to know how it reacts, just in case. Is there a way to check its function without risking bashing into something?
Member
Joined: Jun 2009
Posts: 159
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2016 C 300 4matic Lunar blue
A sales person at my dealership told me a few years ago that the dealership had a course in the back that included blowups, that was sometimes used to demonstrate the braking system. I was never invited to try it. My understanding is that your car has to be going faster than 20 mph. I guess it is possible that you could hit an inflatable just right and pop an airbag.
Super Member
Joined: Mar 2018
Posts: 740
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From: Westchester County, NY
‘15 C300 4M Sport, ‘20 GLC300
I believe you have to be going over 30 mph. With that said I would not attempt to hit a cardboard box at those speeds. It will damage something for sure. An inflatable pool float is prob a better idea.
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Member
Joined: Jan 2017
Posts: 96
Likes: 17
From: Sydney
W205 C250
I guess what I am saying is sooner or later it will self test
regards
Greg
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A gaggle of MB's
In my words - the Collision Prevention Assist + System (which is now incorporated as "Brake Assist") does three things based as triggered by short range forward radar/w-algorithm : (1) alerts pending collision situation (2) engages full emergency/ABS level braking at time/distance/collision pending (3) the 3rd key thing - in the event of driver initiated braking after alert but before auto emergency braking turns CPA+ off and activates Brake Assist ..
At MB "Brand Immersion" - the demo is like this - with a large foam block wall (each foam block wrapped in radar reflective foil) - drive at 30mph head on - and NOT touch the brake (which is very hard not to do) - Alert - the full ABS braking... in one-out-of-four/five the driver instinctively applies brakes either pre-alert/post-alert - takes CPA+ off-line.... yes we had some wall-busters..
At MB "Brand Immersion" - the demo is like this - with a large foam block wall (each foam block wrapped in radar reflective foil) - drive at 30mph head on - and NOT touch the brake (which is very hard not to do) - Alert - the full ABS braking... in one-out-of-four/five the driver instinctively applies brakes either pre-alert/post-alert - takes CPA+ off-line.... yes we had some wall-busters..
Newbie
Joined: Jul 2019
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W205
The system is active from just 10kph when rolling towards a static object, it will brake to a stop on its own after it has audibly warned you. You just need to trust the car, as a side note if you have the brake pedal slightly pressed it will not warm you, but it will press the brake harder if it is needed in order to assist you stopping . Bas plus works even when rolling at 140 kph if the speed difference with the other object/car isn't too large. My guess is going that it you are going 140 kph towards the rear end of a vehicle that is traveling at 110 kph it will safely slow down your car. If I am not mistaken the radar has a 25 meter detection range for Bas plus. At 100kph you are doing that distance in one second, no car will stop from that speed in one second. Remember this is a safety system not a toy and you drive a pretty expensive car, a small collision is at least 1k in damage. Be safe.
Newbie
Joined: Jul 2019
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S205
Two days ago I was driving back to home and even though I made enough break (I supposed so) looks like my s205 did not trust my calculation and made a hard full break.
And my wife told me that it happened to her three times and all prevented an accident.
So it works. Afaik if you do not have distronic plus it works till 75kmh, with diatonic plus 170kmh.
And my wife told me that it happened to her three times and all prevented an accident.
So it works. Afaik if you do not have distronic plus it works till 75kmh, with diatonic plus 170kmh.
Junior Member
Joined: Jun 2019
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C300
Newbie
Joined: Jul 2019
Posts: 14
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S205
sure i watched the videos on Mercedes website, there it explains how it works and limits I heard there. I may find the exact video later, from mobile it will be hard to find it unfortunately.
edit: I live in Germany and watched the videos from German website.
Out Of Control!!
Joined: Nov 2018
Posts: 11,403
Likes: 5,325
From: San Francisco Bay Area
2019 C63CS
It detects stationary objects ahead at up to 45 mph and can autonomously stop the car. It detects moving objects ahead and can autonomously brake up to 65 mph w/o distronic and up to 125 mph with distronic.
Newbie
Joined: Jul 2019
Posts: 14
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S205
Here in Germany sometimes the cars just stop on the highway because of traffic, exactly like in the video. And here there are some areas without speed limits. So this limits should be known by drivers. If you just think that it will break anytime, that’s a big mistake.
Out Of Control!!
Joined: Nov 2018
Posts: 11,403
Likes: 5,325
From: San Francisco Bay Area
2019 C63CS
I can definitely confirm that the system doesn't act at higher speeds. I have distronic in my '19 C63S and on the German Autobahn I had a delivery van going about 60 mph pull into my lane w/o looking properly while I was coming up behind him at a speed of around 150 mph on slightly damp roads. There was no braking assistance or tightening of seat belts, but I managed on my own to slow down enough to avoid crashing into the van. But on another occasion at slower speeds on B roads, the system reacted with a false positive and strapped me in with the seat belts along with audible warnings, but quickly realized there was no danger. It scared both me and my mom who was sitting on the front passenger seat, though.
Last edited by superswiss; Jul 27, 2019 at 06:25 PM.
