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Home > Faults & Fixes (L663) > L663 D300 - solid 'thunk' from front end as braking to stop?
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DeftdDefen



Member Since: 06 Jun 2022
Location: Epsom
Posts: 7
United Kingdom 
L663 D300 - solid 'thunk' from front end as braking to stop?
Anyone else have a sound or sensation that the gearbox is making a thud when pulling up?
It's not speed dependant, aka hard breaking it's just as you transition to stationary.

Sounds like a rough downshift to first but wanted to know if this is expected or suspicious before I bug my dealer.
Post #954783 7th Jun 2022 10:06am
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J77



Member Since: 04 Nov 2019
Location: Fife
Posts: 3395
Scotland 
Sounds like something mine suffered with, I also had 2wd warnings pop up, to fix this they done various updates one was for the transmission. It cured my 2wd warnings but also cured the thud you mention. 24MY 90 D250 HSE, Tasman Blue
Post #954785 7th Jun 2022 10:10am
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DeftdDefen



Member Since: 06 Jun 2022
Location: Epsom
Posts: 7
United Kingdom 
Any clue on what they charged you for doing for me to ask for same?
Post #954789 7th Jun 2022 10:13am
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J77



Member Since: 04 Nov 2019
Location: Fife
Posts: 3395
Scotland 
Warranty Thumbs Up 24MY 90 D250 HSE, Tasman Blue
Post #954798 7th Jun 2022 11:18am
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DeftdDefen



Member Since: 06 Jun 2022
Location: Epsom
Posts: 7
United Kingdom 
Well, one trip to service centre later no insights, fault codes or more.
Can't reproduce on a cold drivetrain and now having to resort to sound recordings when it starts.

On the + side it got a wash Very Happy
Post #955737 17th Jun 2022 11:35am
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Chugga90



Member Since: 07 Sep 2014
Location: Bucks
Posts: 208
The dealers in question, are they close to the M3?
Post #955771 17th Jun 2022 6:04pm
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DeftdDefen



Member Since: 06 Jun 2022
Location: Epsom
Posts: 7
United Kingdom 
A23.

That said it’s always when hot at the end of a 2H journey and I am not surprised on no reproduction.
We are on a ‘capture the sound, get it to the factory to diagnose’ plan which is as good as it gets.

Worse is working out the squeak it makes aft parked up like a hand cranked clothes line, no air suspension so very odd..
Post #955786 17th Jun 2022 7:32pm
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soundslegal



Member Since: 30 Oct 2021
Location: Woking
Posts: 101
United Kingdom 
I have a similar issue on my Velar, had to keep going back until they reproduced it. It needed a complete new rear diff in the end!! So long as you get sorted whilst under warranty, just keep plugging away at them when convenient to you...

That one between the M3 and the M4 was the one I kept having to nag....
Post #955798 17th Jun 2022 8:47pm
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