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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-29-2008, 09:00 AM
nickofoxford's Avatar
2 doors, 5 cylinders
 
Join Date: Jul 2008
Location: S.E. PA
Posts: 447
Brake wires..?

I have a 1980 240D w123, and I drove her home from the guy I bought her off of, and the front brakes are very grabby, but they pulsate. I checked the brakes and found that there is a wire going into the brakes. Interested, I followed the wire up through the wheel well (on the drivers side tire) and found the poor thing cut, tangled underneath a big bunch of wires coming out of the firewall. The rest of this cable goes under the relay box on the top of the drivers side tire well, I found that it has 3 wires wrapped in a black sheath on the cut side of the connector, and 2 wires on the side that goes under the fuse box. So anyway I guess it got pinched or ripped sometime before I got her. Anyone know what these wires are for?? Thanks in advance,
Nick
Reply With Quote
  #2  
Old 07-29-2008, 09:16 AM
fruitcakesa's Avatar
Registered User
 
Join Date: Jun 2008
Location: Vermont
Posts: 1,129
Brake pad wear sensor?
__________________
1981 240D 132k 4 spd manual http://www.fuelly.com/smallsig-us/40338.png
Finally got the clutch bled!
2004 VW Jetta TDI 5 speed 272k
Reply With Quote
  #3  
Old 07-29-2008, 09:17 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,105
they alert you to pad thickness by grounding to the rotor when you wear out your pads.
a yellow light on your dash will come on.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #4  
Old 07-29-2008, 09:18 AM
Chad300tdt's Avatar
SE pa BenzFest 8/19/2017
 
Join Date: May 2007
Location: North Wales, PA
Posts: 4,000
Quote:
Originally Posted by fruitcakesa View Post
Brake pad wear sensor?
I agree.

EDIT: vstech gave the correct technical answer.
__________________
10th Annual Southeast PA Benzfest start at post #1472

Chad
1985 300CD - "Gladys" - 255,XXX miles - FOR SALE
2005 Dodge Magnum 3.5 SXT AWD
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
Reply With Quote
  #5  
Old 07-29-2008, 09:28 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,105
oh, and if your brakes are pulsating, first check under your hood for abs system, it will be a box with brake lines coming to it from the master cylinder...
if you do not have it, (very rare to have it...) your rotors are warped and should be replaced.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #6  
Old 07-31-2008, 01:32 PM
nickofoxford's Avatar
2 doors, 5 cylinders
 
Join Date: Jul 2008
Location: S.E. PA
Posts: 447
hey thanks everyone, it's the wear sensor. im getting the yellow light on the dash. i'll have to check for that box, i doubt it has ABS but maybe.. the car sat for about a year before i bought it so it's most likely the brakes (drum) being warped. it seemed the harder i pushed the brakes when i could on the drive home the lighter the pulsating got.
Reply With Quote
  #7  
Old 07-31-2008, 03:42 PM
Registered User
 
Join Date: Nov 2004
Location: Nova Scotia, Canada.
Posts: 6,510
Quote:
Originally Posted by nickofoxford View Post
hey thanks everyone, it's the wear sensor. im getting the yellow light on the dash. i'll have to check for that box, i doubt it has ABS but maybe.. the car sat for about a year before i bought it so it's most likely the brakes (drum) being warped. it seemed the harder i pushed the brakes when i could on the drive home the lighter the pulsating got.

Just rust buildup on the rotors from sitting perhaps. Remove a wheel and have a look. Where the pads sat should have no rust in comparison to the rest of the braking area of the rotor. Rotors may clean down enough to be serviceable. If not they can be had for 20.00 or so new apiece. Car may have sat more than a year or in very poor storage conditions.
Reply With Quote
  #8  
Old 07-31-2008, 03:49 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,105
Quote:
Originally Posted by nickofoxford View Post
hey thanks everyone, it's the wear sensor. im getting the yellow light on the dash. i'll have to check for that box, i doubt it has ABS but maybe.. the car sat for about a year before i bought it so it's most likely the brakes (drum) being warped. it seemed the harder i pushed the brakes when i could on the drive home the lighter the pulsating got.
there is no drum brakes associated with your brake pedal.
there is a drum inside the rotor that is applied with the Emergency/parking brake.
4 wheel discs baby!
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #9  
Old 07-31-2008, 07:25 PM
Stevo's Avatar
Registered User
 
Join Date: Apr 2002
Location: NW WA
Posts: 6,285
Quote:
Originally Posted by vstech View Post
oh, and if your brakes are pulsating, first check under your hood for abs system, it will be a box with brake lines coming to it from the master cylinder...
if you do not have it, (very rare to have it...) your rotors are warped and should be replaced.
ABS on a 240D, that would be nice, was there such a thing? I had 240D with SLS, some folks never herd of that
__________________

1985 Euro 300TD 5 spd 220K
1985 Euro 240D 5 spd 130K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
Reply With Quote
  #10  
Old 08-19-2008, 01:33 AM
nickofoxford's Avatar
2 doors, 5 cylinders
 
Join Date: Jul 2008
Location: S.E. PA
Posts: 447
haha i wish i had ABS tood but the good news would be it is four wheel disks a friend said they were drums. and man, she needs a good hour drive with my pinky toe on the brakes the whole time. it had sat for a good year, outside, before i bought it. poor thing has cancer all over the body, but boy the interior is so nice . so this brake pad wear sensor, it can't short to turn the light on, my light is on all the time now and the wire to the sensor got sliced im going to fix the wire up this weekend and see how that sensor works. thanks again guys.
Reply With Quote
  #11  
Old 09-20-2008, 09:57 AM
Registered User
 
Join Date: Oct 2004
Location: Atlanta,GA
Posts: 174
Is it really necessary to replace these every pad change if you change the pads before it comes in contact with the disc ? - Thanks

Last edited by rkpatt; 09-20-2008 at 12:13 PM.
Reply With Quote
  #12  
Old 09-20-2008, 10:08 AM
Registered User
 
Join Date: Sep 2004
Posts: 8,487
Quote:
Originally Posted by rkpatt View Post
Is it really necessary to replace these every pad change if you changew the pads before it comes in contact with the disc ? - Thanks
Absolutely not.
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 03:17 AM.


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