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Old 09-19-2017, 04:36 AM
Registered User
Join Date: Sep 2017
Location: Batesville, Indiana
Posts: 9
1980 450sl Knocking when brakes applied

Hey folks, I am getting this loud knocking, and shuddering sound when applying the breaks from forward driving. It is a very fast knock like a machine gun and feels like it is only in front passenger side of the vehicle. I need to test it again while rolling in neutral to see if it only happens in drive but does this sound familiar to anyone? I do not get this pulse by applying the breaks when the car is stationary so I am not thinking it could be a vacuum issue with the brake system, it is only when the car is moving forward. The faster the car goes the faster and louder the knocking sound is. Any ideas?
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Old 09-19-2017, 05:35 AM
optimusprime's Avatar
Trevor Hadlington
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,210
You need to jack it up from the front and spin the wheel .Sounds to me like wheel bearings .Also backing plate on the disc pads might have parted company with the pad material , so are in 2 parts
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Old 09-19-2017, 11:11 AM
Diseasel300's Avatar
Registered User
Join Date: May 2016
Location: Texas Hill Country
Posts: 4,666
Wheel bearings, worn/trashed suspension components, etc will cause knocking.

Before getting carried away, CHECK YOUR LUGNUTS!!!! I had exactly what you describe and it was from a tire shop not torquing down the lug nuts!
'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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Old 09-20-2017, 02:34 PM
Registered User
Join Date: Sep 2017
Location: Batesville, Indiana
Posts: 9
Thanks for the input. I will check those items today and try to get a video of it if it continues.
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