Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Mercedes-Benz SL Discussion Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-19-2017, 05:36 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?
Reply With Quote
  #2  
Old 09-19-2017, 06:35 AM
optimusprime's Avatar
Trevor Hadlington
 
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,171
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
Reply With Quote
  #3  
Old 09-19-2017, 12:11 PM
Diseasel300's Avatar
Registered User
 
Join Date: May 2016
Location: Texas Hill Country
Posts: 4,271
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
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
Reply With Quote
  #4  
Old 09-20-2017, 03:34 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.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 07:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page