GLC Class (X253) Produced 2016-2022

Loud "clunk" sound from rear axle area

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Old Nov 8, 2025 | 02:01 PM
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GLC 300 4matic
Loud "clunk" sound from rear axle area

My 2023 GLC 300 4matic occasionally makes a loud clunk sound after starting and shifting into reverse. It sounds like an emergency brake or the mild hybrid is locked and released after shifting into park. Universal question: Is anyone experiencing this too, or have you had it identified and fixed? Thanks.
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Old Nov 9, 2025 | 10:58 AM
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From: MBworld
bone stock E55 AMG
moved to X253 forum...
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Old Nov 9, 2025 | 12:23 PM
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former-03 C240,2 ML BlueTecs,20 GLE450 E-ABC,15 Cayenne D,17 Macan
Originally Posted by Redfish0412
My 2023 GLC 300 4matic occasionally makes a loud clunk sound after starting and shifting into reverse. It sounds like an emergency brake or the mild hybrid is locked and released after shifting into park. Universal question: Is anyone experiencing this too, or have you had it identified and fixed? Thanks.
Probably the most-reported sound is the parking brake stuck to the disc, because of rust following a carwash or other dousing.
The parking brake is automatically applied at shutdown, but if you release it before opening the door (or some other sequence - I'd have to go out and cogitate) you can avoid the rusting. It's not harmful if that's what you're experiencing.
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Old Nov 10, 2025 | 10:52 PM
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18 GLC300 4M
I had a very similar experience and it turned out to be the transmission. Diagnosed as a problem with the valve body.
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