Knocking noise heard from rear-passenger side when decelerating.. Any Ideas?

Kameron Samford · 07-21-2022, 09:07 PM

I just purchased a 2019 430i Gran Coupe xDrive and while accelerating and at low speeds it's fine.

The problem starts when going 20MPH+ and decelerating, it then sounds like rear passenger wheel is "knocking" until I accelerate again.

Tested it by reversing, no sound. Tested it by accelerating and decelerating multiple times to mimic the same knocking sound.

I have service scheduled for August 6th but if anyone has any ideas to bring with to service, it would be greatly appreciated.

-first time BMW owner, and loving it.

Danpaulyyz · 12-18-2022, 03:13 PM

It’s probably just exhaust noise sounding like a bunch of mini-backfires.
Does it do it more in sport mode than other modes?

sergsaa · 01-11-2024, 04:43 AM

I had also a noise going on under the same circumstances, in my case end up being the parking brake cable rubbing on the drive shaft, due to a broken plastic bracket, there's a YouTube which can give u an idea of what's on, good luck.

https://youtu.be/oj0Cz3DGg9M?feature=shared

07-21-2022, 09:07 PM	#1
Kameron Samford Registered 0 Rep 2 Posts Drives: 2019 430i Gran Coupe xDrive Join Date: Jul 2022 Location: Austin, TX iTrader: (0)	Knocking noise heard from rear-passenger side when decelerating.. Any Ideas? I just purchased a 2019 430i Gran Coupe xDrive and while accelerating and at low speeds it's fine. The problem starts when going 20MPH+ and decelerating, it then sounds like rear passenger wheel is "knocking" until I accelerate again. Tested it by reversing, no sound. Tested it by accelerating and decelerating multiple times to mimic the same knocking sound. I have service scheduled for August 6th but if anyone has any ideas to bring with to service, it would be greatly appreciated. -first time BMW owner, and loving it.
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12-18-2022, 03:13 PM	#2
Danpaulyyz New Member 2 Rep 13 Posts Drives: 2018 F30 328D Join Date: Dec 2022 Location: Henderson, NV iTrader: (0)	It’s probably just exhaust noise sounding like a bunch of mini-backfires. Does it do it more in sport mode than other modes?
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01-11-2024, 04:43 AM	#3
sergsaa New Member 0 Rep 7 Posts Drives: 2015 bmw 428i Join Date: Oct 2023 Location: longview Tx iTrader: (0) Garage List 2015 bmw [0.00]	I had also a noise going on under the same circumstances, in my case end up being the parking brake cable rubbing on the drive shaft, due to a broken plastic bracket, there's a YouTube which can give u an idea of what's on, good luck. https://youtu.be/oj0Cz3DGg9M?feature=shared
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