Knocking sound while soft breaking CT 4S MY25.

[Mats]

Last November, I swapped my CT4S MY23 to a new MY25 - Oak Green Metallic Neo - l8ve the colour. Almost immediately, I noticed a low knocking sound from the back of my drivers seat while soft breaking. It frequently happened even while using Innodrive reaching speed limits from e.g. 70 to 50 km/h. Brought it up with my service center and we test drove the car together and even if it doesn't occur all the time, they got to hear it as well.
They kept the vehicle for roughly a week at two occasions without being able to locate the problem. They were also claiming being in contact with Zuffenhausen w/o any solution.
On the third time in the service center, I got a CT 4 MY25 as a loaner. To my surprise after just a short ride, I noticed the same knocking sound even in this vehicle. While still on the road, I called up the technichan and told him. In any case, they kept my vehicle over the weekend while they obviously tested other new MY25 units with the same result.
On Monday, they called me up and confirmed the result from their test of the other units with the same issue. According to new feedback from Zuffenhausen, it is coming from a "break enforcement system" in the car and hence no solution available. This sounds very strange and odd to me for a car at this range.

Anybody in our forum with same experience?

//Mats

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[trycan]

Maybe post an audio clip. I don’t know what a knooking sound is.
The car uses physical brakes when you first start a drive. We live on a hill and when I go anywhere, it will drag the brakes to dust them off, and then afterwards switch to regen braking. I can hear the difference.

 

[MoniqueDenver]

I suspect that OP means "knocking" sound? It's a hard word to spell and English is a tough language.

 

[Mats]

I suspect that OP means "knocking" sound? It's a hard word to spell and English is a tough language.

Of course, you are correct. AI spelling is tricking you more than helping you at times.

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