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 10-14-2007, 10:31 PM
Registered User
 
Join Date: Oct 2007
Location: Granite Bay California
Posts: 3
1985 380 SL mushy brakes

My son's 1985 380SL brakes are soft and mushy. So we replaced the front calipers with new rebuilt ATE's. new front pads, new rear pads and bleed the lines. No help so we replaced the Master brake cylinder ( bought at Kragens) and the vacuum hose line going to the booster ( bought at Mercedes). Still soft and no brake fluid leaks. Last two parts left that I know little about are brake booster and convergence valve. Any thoughts on how to test? Thanks in advance
Reply With Quote
  #2  
Old 10-14-2007, 11:26 PM
Larry Delor's Avatar
What, Me Worry?
 
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,112
Replacing the flexible brake lines, would be the next thing that I would do - they can degenerate on the inside, and look fine on the outside.
http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=22Q14UFJL27C1E7OTN&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1985&product=N7000-16092&application=000243572
__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
Reply With Quote
  #3  
Old 10-15-2007, 10:45 PM
Registered User
 
Join Date: Oct 2007
Location: Granite Bay California
Posts: 3
Thanks Larry

Larry, I replaced 1 of the 2 front since it broke during the replacement. The other 3 have not been done but I don't believe that is the issue since the brake fluid streams out on bleeding very well. Do you know how to check the booster or convergence valve ( prior to ABS) it is suppose to balance pressure. The master brake cylinder sends a front and back line to the convergence valve and then from their it sends out the pressure to each brake. Thanks Thomas
Reply With Quote
  #4  
Old 10-16-2007, 10:55 AM
Registered User
 
Join Date: Mar 2003
Location: Convent Station, NJ
Posts: 755
Quote:
Originally Posted by tshort View Post
Larry, I replaced 1 of the 2 front since it broke during the replacement. The other 3 have not been done but I don't believe that is the issue since the brake fluid streams out on bleeding very well.
Thomas, I think what Larry is saying is that the interior portion of the lines deteriorate with time. It is a common item to replace as the lines stretch with time, especially 22+ years. Stretch = mushy.
__________________
Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
Reply With Quote
  #5  
Old 10-16-2007, 11:08 AM
TX76513's Avatar
Platinum Member
 
Join Date: Apr 2003
Location: Brandon, Mississippi
Posts: 5,203
Larry is right on - have somebody step on and hold the brake down while you look at the lines - look for "ballooning"
__________________
BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif
15 VW Passat TDI
00 E420
98 E300 DT
97 E420 Donor Car - NEED PARTS? PM ME!
97 S500
97 E300D
86 Holden Jackaroo Turbo D
86 300SDL
(o\|/o)
Reply With Quote
  #6  
Old 10-16-2007, 04:03 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Are you using a pressure bleeder? Highly recommended.

If not, be sure that both chambers of the reservoir are full before you start pumping and are not dropping and allowing air into the system. One of the chambers takes a few minutes to fill and if you start pumping right after adding fluid, you get air in the lines.

Also, at the bleeders, be sure to use a clear hose and a good light to be sure that you're not getting tiny bubbles in the fluid.

And you did go RR, LR, RF, LF, didn't you?
__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
Reply With Quote
  #7  
Old 10-16-2007, 10:30 PM
Registered User
 
Join Date: Oct 2007
Location: Granite Bay California
Posts: 3
Thanks Chuck

Appreciate the advice since I did rears first but not the specific order. I will also use my professional bleeder which has the clear tubes after I replace the other 3 lines. Thanks To everyone. Thomas
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 - 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