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
  #16  
Old 04-12-2010, 01:57 PM
johnathan1's Avatar
Registered User
 
Join Date: Feb 2008
Location: Downey, SoCal
Posts: 1,190
Not done a proper bleeding? I have never done any work on the system...so why would it need to be bled? Pedal feel, travel and firmness has always been perfect.

I'll start shopping around for a NEW unit...thanks for the help guys!

Any recommendations on brake fluid?

__________________
Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles
Reply With Quote
  #17  
Old 04-12-2010, 02:29 PM
Registered User
 
Join Date: Sep 2006
Location: Middle TN
Posts: 4,154
Quote:
Originally Posted by leathermang View Post
The chances are you have not done a proper bleeding of your system...
no use looking to replace any parts until you have done that .

If his system was working and now it isn't, something other than bleeding is wrong. He either has a leak in the master cylinder or caliper as a bad hose would go to the floor. Simply replacing parts without knowing which part is bad won't fix the problem.

Rebuilding is a matter of RTM and having the proper tools. It used to be common back when these cars were new. Results varied as do the results of today's reman & cheap imports. Calipers and master cylinder can be rebuilt IF he can find kits and a hone.

Regardless of whether he rebuilds or replaces, he is going to have to diagnose. Leaky calipers are usually apparent as soon as the boot is pulled back from the piston. Masters are usually apparent by pulling them away from the firewall or booster and looking under the seal. Sometimes masters have internal leaks that don't show up visually but never give a solid pedal no matter how much they are bled.

Any deteriorated hoses or brake hardware should also be changed when brakes are repaired. Brake disks have minimum thickness specs and can be turned id thick enough. Replacing pads will be a judgment call based on how much pad is left and whether they are contaminated with brake fluid.

Buying local will help if parts have to be returned. Balance this against quality of Phil's parts. I suggest including him in the decision process. Do it once & be done for another 30,000 mi & then replace pads.
__________________
85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.
Reply With Quote
  #18  
Old 04-12-2010, 03:40 PM
Registered User
 
Join Date: Sep 2001
Location: central Texas
Posts: 17,281
If your pedal is soft do a proper bleeding...
while you are down there you just might see something that is causing the problem...
even moisture in the fluid after a while can cause a soft pedal...
So bleeding a system with reports of the pedal being soft is the logical first thing to do...
If you SEE leaks ... then certainly look at those items causing that...
Reply With Quote
  #19  
Old 06-25-2011, 08:02 PM
Registered User
 
Join Date: Mar 2010
Location: Chicago Il
Posts: 44
Quote:
Originally Posted by leathermang View Post
The chances are you have not done a proper bleeding of your system...
no use looking to replace any parts until you have done that .
i have an 87 300d , my rears brakes failed last week when they got hot and one tire was in fire, i managed to change calipers, hoses, pads and rotors but now when i put them all together and have the lines flushes and bleed the rears tiree got again hot, i replaced the master cylinder with an used one from a junkyard and now i have spongy pedal after firestone perform me a new bleeding and flushing for the brakes.
You might think that could be some air in the master or this replacement master is shot too?
I'm feeling desperate now and any help will be more than welcome
Reply With Quote
  #20  
Old 06-25-2011, 09:56 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,042
Quote:
Originally Posted by adysor View Post
i have an 87 300d , my rears brakes failed last week when they got hot and one tire was in fire, i managed to change calipers, hoses, pads and rotors but now when i put them all together and have the lines flushes and bleed the rears tiree got again hot, i replaced the master cylinder with an used one from a junkyard and now i have spongy pedal after firestone perform me a new bleeding and flushing for the brakes.
You might think that could be some air in the master or this replacement master is shot too?
I'm feeling desperate now and any help will be more than welcome
You did not say if the used Master Cylinder solved the overheating problem?
If the Air has been bled out sounds like the used Master Cylinder is not good either.

The answer is to get a good rebuilt or a New Master Cylinder (I bought a new one FENCO made in Taiwan has been working OK for several years now).
If using a Master Cylinder Rebuild kit is cheaper you can do that but you need to inspect the Bore of the Master Cylinder for pitting to evaluate if it can be reused.
Also on my Master Cylinder there is a Pin that needs to be removed in order to take the guts out of the Master Cylinder.

In the pic below item #27; the Pin needs to be pulled up and out of the Master Cylinder in order to get the Piston out.
Attached Thumbnails
Rebuilding W123 Master Cylinder (seal kit?)-master-cylinder-d.jpg  

__________________
84 300D, 82 Volvo 244Gl Diesel
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 05:01 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page