BMW Main Dealer Do Not Know What This Sound Is

honahon · 02-11-2016, 06:30 AM

Morning all.

This is my first post on the F30 forum after selling a e90 M3 in exchange for a 64 plate f31 335D M Sport Touring with the M performance upgrade kit - I think it's stunning, from some angles, it almost reminds me of the old z3 M coupe.

OK - I've only just taken ownership of this car around 3 weeks ago. I've done very few miles and not driven it hard at all.

Got back from taking my daughter to school nearly 2 weeks ago and all 4 brakes were making a terrible sound that I have never heard before from any car - I can't even find the noise replicated on the internet.

Car was promptly low loaded back to my main dealer, where it has sat for over a week or so with all the 'top mechanics' scratching their heads. They have dismantled all the braking system and cannot find a fault - even though they openly admit that there is a 'serious' issue. A PUMA has been raised with tier 3 support in Germany, and they too are not sure what is wrong. At the current time, they are now just replacing parts until it's resolved.

Here's a video of the noise coming from all 4 brakes when depressing the pedal once up to temperature. The noise does not happen when cold, and the noise is a lot louder than the video reflects.

Any ideas folks?

963mw · 02-11-2016, 09:50 AM

I used to get a little crackling noise myself when car is at operating temp and only when stationary. Even though I don't have the same brakes as you do, we have a very similar sound but yours is just much louder. My car is at the dealership now, once it is done, I will inform you whether the sound is gone after a brake pad replacement.

MickAv8r · 02-12-2016, 01:37 PM

Sounds like something is vibrating against the dust shields the sheet metal surrounds. Odd that it would be on all 4 wheels. Maybe there is a different part number ie smaller shield for the larger brakes?

With the car on a lift and the wheels off it should be obvious and easy to isolate the noise source.

yoandry · 02-16-2016, 07:19 PM

That is a dirty car.

The dealer tech doesn't want to get dirty. Wash it then you will see.

honahon · 02-21-2016, 09:31 AM

Thank you for the replys. The dealer ended up swapping out the brake pads, discs and drums. Thankfully I didn't get a bill! Good as new now..

02-11-2016, 06:30 AM	#1
honahon Registered 0 Rep 4 Posts Drives: F31 335D M Sport Touring Join Date: Feb 2016 Location: Hampshire iTrader: (0)	BMW Main Dealer Do Not Know What This Sound Is - Do you? Morning all. This is my first post on the F30 forum after selling a e90 M3 in exchange for a 64 plate f31 335D M Sport Touring with the M performance upgrade kit - I think it's stunning, from some angles, it almost reminds me of the old z3 M coupe. OK - I've only just taken ownership of this car around 3 weeks ago. I've done very few miles and not driven it hard at all. Got back from taking my daughter to school nearly 2 weeks ago and all 4 brakes were making a terrible sound that I have never heard before from any car - I can't even find the noise replicated on the internet. Car was promptly low loaded back to my main dealer, where it has sat for over a week or so with all the 'top mechanics' scratching their heads. They have dismantled all the braking system and cannot find a fault - even though they openly admit that there is a 'serious' issue. A PUMA has been raised with tier 3 support in Germany, and they too are not sure what is wrong. At the current time, they are now just replacing parts until it's resolved. Here's a video of the noise coming from all 4 brakes when depressing the pedal once up to temperature. The noise does not happen when cold, and the noise is a lot louder than the video reflects. Any ideas folks? Last edited by honahon; 02-11-2016 at 07:54 AM.. Reason: typo
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02-11-2016, 09:50 AM	#2
963mw BMW Fanatic 331 Rep 1,076 Posts Drives: M2 Join Date: Nov 2014 Location: Mexico iTrader: (0)	I used to get a little crackling noise myself when car is at operating temp and only when stationary. Even though I don't have the same brakes as you do, we have a very similar sound but yours is just much louder. My car is at the dealership now, once it is done, I will inform you whether the sound is gone after a brake pad replacement. __________________ 18 BMW M2 \| ER DP \| ER CP \| Wagner Evo 2 Comp Intercooler \| Aquamist HFS4 \| BM3 \| CSF Oil Cooler \| AFE Drop-in Filter \| Bilstein B16 PSS10
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02-12-2016, 01:37 PM	#3
MickAv8r Captain 175 Rep 766 Posts Drives: 2014 EBII 328ix Join Date: Mar 2014 Location: New Hampster iTrader: (0)	Sounds like something is vibrating against the dust shields the sheet metal surrounds. Odd that it would be on all 4 wheels. Maybe there is a different part number ie smaller shield for the larger brakes? With the car on a lift and the wheels off it should be obvious and easy to isolate the noise source. __________________ Well weathered leather, hot metal and oil, the scented country air. Sunlight on chrome, the blur of the landscape, every nerve aware! 2014 328ix EBII - Sport AT, Light Pkg, Blk Dakota, Moonroof, Navigation, Heated Seats, HK Audio, Driver Assist, Sport Pedals, Dinan Springs, Bilstein B8s, M-Performance BBK
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02-16-2016, 07:19 PM	#4
yoandry Colonel 693 Rep 2,083 Posts Drives: G80 M3CX & X5 M50i Join Date: Jan 2011 Location: Naples, FL iTrader: (0)	That is a dirty car. The dealer tech doesn't want to get dirty. Wash it then you will see. __________________
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02-21-2016, 09:31 AM	#5
honahon Registered 0 Rep 4 Posts Drives: F31 335D M Sport Touring Join Date: Feb 2016 Location: Hampshire iTrader: (0)	Thank you for the replys. The dealer ended up swapping out the brake pads, discs and drums. Thankfully I didn't get a bill! Good as new now..
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