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

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 12-05-2003, 09:03 PM
wielder of thor's hammer
 
Join Date: Jul 2003
Location: Long Island, NY
Posts: 321
ABS clunking, noisy, felt in brake pedal, O.K.? w124

Well, I just got home from a 4 hour commute that normally take 1/2 an hour, because of the "blizzard" we got in New York today. My first exparience driving my 300e in the snow. I actually was suprised, it was not that bad. From this forum I had a preconception that it was horrible in snow, but it is much better than the 86 Regal I used to drive. Anyway the ABS brakes came on for the first time. I was suprised to hear loud clunking and feel vibration through the brake pedal when they engaged. Is this normal? They worked ok but all other ABS I've ever experienced were not noisy like this. I just didn't think that obnoxious clunking could be a normal sound.
__________________
headrivenoise... listen.
Reply With Quote
  #2  
Old 12-07-2003, 02:23 AM
Senior Member
 
Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
That is perfectly normal. What you felt was the ABS system pulsing the fluid to one of the wheels to keep it from locking up.

Peter
__________________
Auto Zentral Ltd.
Reply With Quote
  #3  
Old 12-07-2003, 12:46 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Re: ABS clunking, noisy, felt in brake pedal, O.K.? w124

Quote:
Originally posted by dirtysocks
I was suprised to hear loud clunking and feel vibration through the brake pedal when they engaged. Is this normal? They worked ok but all other ABS I've ever experienced were not noisy like this. I just didn't think that obnoxious clunking could be a normal sound.
You're right. Feeling pulsation in the pedal is normal; loud clunking is definitely not normal. I don't know what it is but if it were me I'd have it checked out soon.
__________________
Steve
'93 400E
Reply With Quote
  #4  
Old 12-07-2003, 01:47 PM
Senior Canadian Member
 
Join Date: Jul 2000
Location: British Columbia, Canada
Posts: 827
MB's ABS system is quite loud by comparison to other cars. have it checked out if you're concerned, but, it's more than likely, normal operation.
__________________
'94 W124.036 249/040 leder; 8.25x17 EvoIIs
'93 W124.036 199/040 leder; 8.25x17 EvoIIs, up in flames...LITERALLY!
'93 W124.036 481/040 leder; euro delivery; 8.25x17 EvoIIs
'88 R107.048 441/409 leder; Euro lights
'87 W201.034 199/040 leder; Euro lights; EvoII brakes; 8x16 EvoIs - soon: 500E rear brakes
'70 R113.044 050/526; factory alloys; Euro lights
Reply With Quote
  #5  
Old 12-07-2003, 02:37 PM
chazola's Avatar
Registered User
 
Join Date: Nov 2003
Location: Dorset, United Kingdom
Posts: 1,238
mine did exactly the same thing. I also had the ASR kick in for the first time. I just figured there was probably some ice stuck in there for a second or two. Braking was fine and the car felt 'solid' on the road compared to my wife's Dodge.
__________________
1993 320TE M104
---------------------------------------------------
past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
----------------------------------------------
"music and women I cannot but give way to, whatever my business" -Pepys
Reply With Quote
  #6  
Old 12-07-2003, 11:56 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
You will definitely notice the ABS on a 300E. I certainly did in Ft. Wayne last saturday AM while leaving, when I slid on some icey snow. Or didn't, actually, but the ABS action is both noisy and obvious at the pedal.

Probably very effective, and the pulsation is telling you to let up on the brakes.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
  #7  
Old 12-08-2003, 12:01 AM
Q Q is offline
Registered User
 
Join Date: Aug 2000
Posts: 839
"the pulsation is telling you to let up on the brakes"

It is counter-productive to modulate the brakes during ABS function. Locating the point of maximum traction is difficult due to the pulsing and you are likely to use less brake pedal pressure keepng the ABS from engaging than you would with a non-ABS car.
Reply With Quote
  #8  
Old 12-08-2003, 07:31 PM
Registered User
 
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
ABS gives longer braking distance than not sliding the tires in the first place. Vibration of the pedal is probably impossible to eliminate anyway, but I suspect Benz left more in so that you would KNOW you are sliding and the ABS is working.

Better to slow down and brake less than depend on the ABS, since all it does is prevent tire lockup, it doesn't decrease stopping distance any at all.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
  #9  
Old 12-08-2003, 09:15 PM
Q Q is offline
Registered User
 
Join Date: Aug 2000
Posts: 839
I agree. The idea is to provide some control over the car when someone panic brakes. In the 7 years that I have owned my 85 380SE, I think I have activated the ABS 3 times. Once was on purpose over ice to see how it would react.
Reply With Quote
  #10  
Old 12-08-2003, 10:35 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Vibration through the pedal: normal

A pulsating noise from the ABS unit when ABS kicks in: normal

"Loud clunking" from ABS: not normal (in my book)
__________________
Steve
'93 400E
Reply With Quote
  #11  
Old 12-08-2003, 10:46 PM
Q Q is offline
Registered User
 
Join Date: Aug 2000
Posts: 839
The clunk should get checked out. You could have some bad joints.
Reply With Quote
  #12  
Old 12-09-2003, 12:20 AM
Bud
Guest
 
Posts: n/a
I agree, the ABS on my 300E doesn't produce a loud clunking.

When I lived in Minnesota I did a comparison test between our '84 190D w/o ABS and the 300E. I drove both down an ice covered road with an intersecting road.

Driving at a relatively slow speed and stepping on the brakes to make the turn off on the intersecting road simply locked up the wheels on the 190D and I skidded right past the turn.

With the 300E, I had complete control and was able to make the turn.

Note that Mercedes have a REAL ABS system which uses expensive, high speed solenoid's. For a while at least, American car manufacturer's had a cheap imitation that used cheap electric motors that did nothing but *pump* the brakes which (believe it or not) is not how ABS is supposed to work.

With ABS, the brake on the wheel(s) that is not turning is let up and then reapplied. In other words, it reacts to the conditions rather than simply imitating the old manual method of pumping the brakes.
Reply With Quote
  #13  
Old 12-09-2003, 12:30 AM
Registered User
 
Join Date: May 2003
Posts: 2,218
Oh yeah? Well how would you like to be driving an '84 300SD out in the winter w/out ABS at all?:p

Had a real bad experience with this and smacked into a telephone pole once. There was damage, but fortunately none to the car. :p

I LOVE LOVE LOVE LOVE ABS!!! I don't know how I managed without it.
__________________
1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)
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 06:17 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page