M140i - knocking sound when braking..

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Lead79
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M140i - knocking sound when braking..

Post by Lead79 » Thu May 17, 2018 4:52 pm

I’ve recently had a few knocking sounds when braking, while the car was in for the ratting exhaust I asked them to take a look, here’s what they said:

“the noise appears to be from the brake pads moving . There is no further rework available for this as BMW have a document stating this is normal operation.”

They’ve told me everything is working safely, but it seems a bit odd to me...

Any thoughts?

Cheers


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2017 M140i LCI - stock

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.Griff.
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Re: M140i - knocking sound when braking..

Post by .Griff. » Thu May 17, 2018 4:54 pm

They're right (for once). It's the pads moving.

Very common and normal.
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Lead79
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Re: M140i - knocking sound when braking..

Post by Lead79 » Thu May 17, 2018 4:56 pm

.Griff. wrote:They're right (for once). It's the pads moving.

Very common and normal.
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Grumpybearpants
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Re: M140i - knocking sound when braking..

Post by Grumpybearpants » Mon Jun 25, 2018 9:45 am

I'm getting this now. Is it really normal?

Sounds just like this

https://www.youtube.com/watch?v=sgoEO6wJXlo
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Lead79
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Re: M140i - knocking sound when braking..

Post by Lead79 » Sun Jul 08, 2018 7:06 am

Grumpybearpants wrote:I'm getting this now. Is it really normal?

Sounds just like this

https://www.youtube.com/watch?v=sgoEO6wJXlo
It is normal, so BMW tells me! There’s also nothing they can do about it, apparently.. I was told the knocking is due to loose pads but it’s not in any way dangerous.

It’s slightly unnerving tbh, pretty sure brakes shouldn’t be making knocking sounds at all!


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steveespania
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Re: M140i - knocking sound when braking..

Post by steveespania » Sun Jul 08, 2018 10:28 am

Lead79 wrote:
Sun Jul 08, 2018 7:06 am
It is normal, so BMW tells me! There’s also nothing they can do about it, apparently.. I was told the knocking is due to loose pads but it’s not in any way dangerous.

It’s slightly unnerving tbh, pretty sure brakes shouldn’t be making knocking sounds at all!
I understand your concern but there is, by design, a small amount of free play between the pads and the caliper to allow for expansion of the pads. The noise is usually caused by the pads moving slightly in the calipers during the initial bite. On certain types of calipers, there can also be free play in the caliper parts that can also cause a knocking noise during the initial bite.

I would trust the BMW agent in this instance and not worry but if it really bugs you, changing the pads and any related parts such as pins and springs may improve matters.
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masai
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Re: M140i - knocking sound when braking..

Post by masai » Mon Jul 09, 2018 10:41 am

Had my front pads changed recently on my m135i and never heard this thud before or after. Both sets were genuine bmw ones. Guessing its a 140i thing.
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Re: M140i - knocking sound when braking..

Post by JeffH » Mon Aug 13, 2018 11:37 pm

I had exactly the same issue on my M140, clonking noise etc. It was the pads moving in the calipers. I would not put up with that and created a stink at the dealership - pads changed under warranty, noise gone....
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