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 ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 09-25-2000, 11:35 PM
Posts: n/a
I have noticed that when travelling at speeds of 70-90 mph, after maintaining speed for about 10 seconds, a faint humming sound begins which increases to a very audible level (easily noticable above wind noise, a/c, etc). When the brakes are applied, the noise stops. One MB tech said that the emergency brake shoes could be breaking down, and in turn create a harmonic resonance from the particles. Any ideas????
Reply With Quote
Old 09-26-2000, 08:24 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sounds like the pads aren't getting far enough from the discs after application. This usually happens after replacement where the pads are exactly flat and the disc has dished wear with a certain amount of lip.

Depending on what has been done the answer (to your problem) changes. New discs and pads will probably solve it. New pads of a softer compound will also probably do the trick.

Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician
Reply With Quote
Old 09-26-2000, 08:52 AM
Registered User
Join Date: Jun 2000
Location: Dubai, United Arab Emirates
Posts: 238
I would tend to agree with Steve, bear in mind that the bulk of the brake work is done by the front set and if a new set of pads and discs ( rotors ? ) have been fitted recently, it may take a while for them to bed in. You might like to carefully file a champher on the leading edges of all the pads and this will take off the sharp edge of the pad where it contacts the disc. This is often necessary with the harder pad that takes it time to bed in. I would look at the emergency ( hand ) brkae after looking at the main pads and discs as they do very little work indeed, other than to keep the car form moving once stopped. Hope this helps
Reply With Quote
Old 09-26-2000, 09:52 AM
Posts: n/a
Thanks for the info guys. I replaced the front pads about 7k mi ago. The rears I have yet to replace. I will replace them and see what happens. Like I said, it stops after I lightly apply the brakes or make a sudden lateral move, but always starts back again. I use my parking brake daily since my driveway is on a hill..... any thoughts on the e-brake being the culprit??
Reply With Quote
Old 09-26-2000, 12:42 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The parking brakes are shoes inside of the rear disc, doubt that touching brake pedal would have any effect on them.
Reply With Quote
Old 01-11-2002, 08:29 PM
Posts: n/a

Hi Trapper;
I have a 1989 300SE that has a low humming sound while it is being driven.It doesn't matter how fast you go,the sound pitch stays the same.A hard right turn makes it stop and a hard left turn makes it a little louder.As soon as I touch the brakes,it stops.I have had it in the shop twice and they could not duplicate the sound.I know this doesn't help you with your' problem but if I ever resolve it,i'll post back.Good luck.
Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rear Brakes mwkiker Performance Paddock 2 11-05-2004 02:30 PM
clack,clack sound in lft rear wheel on rt turn GEORGEPECKY Tech Help 1 08-24-2004 02:43 PM
1997 E420 rear brake pads gstigler Tech Help 1 12-11-2003 11:40 PM
'90 300se Rear Sags kevinjh Tech Help 4 05-09-2000 09:32 AM
190e, Strange sound from rear end Corey D Tech Help 2 05-19-1999 09:53 PM

All times are GMT -4. The time now is 06:21 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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