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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-18-2011, 04:42 PM
Registered User
 
Join Date: Aug 2009
Location: Seattle
Posts: 366
trouble shooting brake fluid leak

I'm helping a friend with his manual transmission 79 300D. The clutch pedal went soft a few days ago. The fluid reservoir was very low. I refilled it which didn't fix the problem, so at the very least the clutch needs to be bled.

I've looked for leaks around the master and slave cylinder and haven't found anything obvious, however there is brake fluid dripping off of the bottom of the transmission bell housing. The drip accelerates if I pump the brake pedal.

Is there any hose or brake line around the top of the transmission I should be looking for?
Reply With Quote
  #2  
Old 09-18-2011, 04:59 PM
Registered User
 
Join Date: Aug 2008
Posts: 126
The line from the master clutch cylinder to the slave cylinder on the side of the bell housing.
__________________
1979 240D Caledonia Green/cream gone
1982 240D stick Ivory/Palimino
1999 E300D White/grey
Reply With Quote
  #3  
Old 09-18-2011, 05:10 PM
Registered User
 
Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
There is a rod in the end of the Slave cylinder that pushes against the throw out bearing lever.
the seal around the rod is leaking, that is why you see fluid leaking from the bottom of the tranmission.

You will need to replace the Slave cylinder.

It has been recommended that is the slave is replaced, the master cylinder will go next, (Vice versa) so do them both now, and save a headache later having to go back in again.

Here is a good video showing how it all works, and bleeding procedure.
He says BMW, but the mercedes is exactly the same.
http://www.youtube.com/watch?v=wdf--suwqw0


Charlie
__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
Reply With Quote
  #4  
Old 09-18-2011, 10:38 PM
tankowner's Avatar
You talkin’ to me?
 
Join Date: Dec 2007
Location: Columbia, MO
Posts: 907
Quote:
Originally Posted by charmalu View Post
There is a rod in the end of the Slave cylinder that pushes against the throw out bearing lever.
the seal around the rod is leaking, that is why you see fluid leaking from the bottom of the tranmission.

You will need to replace the Slave cylinder.

It has been recommended that is the slave is replaced, the master cylinder will go next, (Vice versa) so do them both now, and save a headache later having to go back in again.

Here is a good video showing how it all works, and bleeding procedure.
He says BMW, but the mercedes is exactly the same.
http://www.youtube.com/watch?v=wdf--suwqw0


Charlie

X2 on the diagnosis and repair. Like Charlie said, the fluid coming out of the bell housing weep hole is from the failing salve cylinder seal.
__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman
Reply With Quote
  #5  
Old 09-20-2011, 11:56 PM
Registered User
 
Join Date: Aug 2009
Location: Seattle
Posts: 366
Cool, thanks for the feedback. Has there been a good write-up done on replacing the slave cylinder? I've done some searching but haven't found anything yet.
Reply With Quote
  #6  
Old 09-21-2011, 12:33 AM
tankowner's Avatar
You talkin’ to me?
 
Join Date: Dec 2007
Location: Columbia, MO
Posts: 907
Quote:
Originally Posted by 240dddd View Post
Cool, thanks for the feedback. Has there been a good write-up done on replacing the slave cylinder? I've done some searching but haven't found anything yet.
Not sure if there is a dedicated step-by-step DIY, but check out post #2 in this link:

Tools to replace clutch slave cylinder on 1983 240d

Charmalu gives most of the details and provides a link on bleeding the system.
__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman
Reply With Quote
  #7  
Old 09-29-2011, 03:16 AM
Registered User
 
Join Date: Aug 2009
Location: Seattle
Posts: 366
Thanks again for the input. Replacing the slave cylinder seems to have resolved the issue.
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 04:01 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