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 03-25-2014, 04:42 PM
Registered User
 
Join Date: Aug 2012
Location: Jacksonville, Florida
Posts: 39
1983 240d manual all 4 calipers not retracting

Howdy!

I couldn't find this exact problem discussed but if there's a link I missed, I'll gladly read it.

Back in September I got my 240d worked on. This included a new master cylinder and new lines to the clutch pedal.

Then in November my alternator died.

Finally got that fixed in January.

Then two weeks ago I was pulling into my driveway and heard a weird noise. The car became difficult to drive (my driveway is on a slight incline) and after I got it level, I could barely move the car by hand.

I finally got a chance to look at all four calipers and they were all stuck closed on the rotors (also I need to change my brake pads).

I can get them to retract using pliers and not too much force. Reapplying the brakes they stick again. Bleeding the brakes (a bit, maybe 2-4oz) at one caliper did not seem to make a difference.

I have reached the end of my knowhow as far as diagnosing goes. What's likely to be wrong and what should I check out?

When the MC was replaced they did not replace the booster (afaik). I can do the work myself (those guys are shysters and soaked me good) I just don't know where to go from here.

Thanks!
Reply With Quote
  #2  
Old 03-25-2014, 06:10 PM
Registered User
 
Join Date: Jul 2008
Posts: 3,740
Are you bleeding the brakes correctly?

Did you bleed the clutch?

Any fluid loss?

Have you replaced the rubber brake hoses?
__________________
Reply With Quote
  #3  
Old 03-25-2014, 06:19 PM
fashion victim immunizer
 
Join Date: Feb 2012
Location: oakland
Posts: 930
theres probably other things that can go wrong but if all are locking up i'd bet its the master cylinder. if they put in a crappy rebuilt unit they can go bad quickly. i've found brake work to be the shoddiest, shadiest and most overpriced of any auto repair. sorry if you got screwed
__________________
1981 NA 300D 310k miles
Reply With Quote
  #4  
Old 03-25-2014, 06:21 PM
Registered User
 
Join Date: Oct 2012
Posts: 4,270
Jack up each wheel. This will allow you to see if the wheel turns easily. Buildup of rust on the rotors surfaces will wear off fast if an issue. Have a good look to see. Remember the back wheels will not turn unless they both are off the ground.

You may have one or two sticking calipers from sitting. Find out the ones they are first. There is a chance it is something else but usually calipers do not sit unused well.

If you find one that is really pretty much stuck. Either loosen the bleeder screw or bake hose at the caliper. Just in case the cause is other than the caliper. If the caliper remains pretty hard on after that then it is the problem. I guess the brake pad sliders could be immobile as well. Make sure the pads can slide on them.
Reply With Quote
  #5  
Old 03-25-2014, 07:07 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 23,549
Read the Text in the picture. When the O-ring is too stiff to act as a sort of spring to pull the Caliper Piston Back it the Piston does not retract and any sort of added gunk in side of the Piston Bore only makes things worse.
Attached Thumbnails
1983 240d manual all 4 calipers not retracting-brake-caliper-piston-seal-deflection-apr-14.jpg  
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #6  
Old 03-25-2014, 09:26 PM
Registered User
 
Join Date: Oct 2012
Posts: 4,270
You have not got the emergency brake on? Something does not quite sound right with your post.
Reply With Quote
  #7  
Old 03-26-2014, 01:50 AM
Registered User
 
Join Date: Mar 2009
Location: San Diego
Posts: 2,806
I would suspect very strongly it is the brake MC. Next time it happens try loosening the lock nuts on the brake line at the MC. There should be 2, one for the front and the other for the rear. Say loosen the front and let it bleeds a little brake fluid then re-tighen it. If it releases both front calipers then it is the MC not releasing, dirt trapped in the hole or bad rebuilt. Then try the other lock nut for the rear.

Good luck.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

2 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
Reply With Quote
  #8  
Old 03-26-2014, 10:42 AM
Registered User
 
Join Date: Sep 2007
Posts: 593
I can remeber having problems with a MC. Still, I do think that with all 4 caliper locked up, that would be my guess. I would loosen one of the bleeder screws. See if that, unlocks that caliper. Then I'd say it would be the hose or the MC. Then might go to one of the brake line connections on the MC. Un do it. See if that or those calipers unlock.
I'd probably replace the rubber brake hoses, if over 10 years old. I usually, try 5 years. I do not have direct experience with a hose collaping, and acting like a one way valve. I was walking my neighborhood, and one guy was working on an old Chevy truck. A front caliper was locked up. He took it to another neighbor who works as a mechanic. He undid the bleader screw, and then replaced the hose. Callapsed hose.
I do use one of the one man bleeders from NAPA. It is a small plastic bottle, that has a magnet on it, to attach to the frame etc. Works good.
Tom
Reply With Quote
  #9  
Old 03-26-2014, 11:53 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,357
If your pads are worn I suggest going ahead and replacing them. Putting the seal back into a different place in the caliper might well relieve the problem with sticking.
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #10  
Old 03-26-2014, 06:25 PM
Control Freak
 
Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,115
Check your Brake Hoses

See the whunter thread on brake hoses
rubber brake lines and brake fluid recommentations
They can rot from the inside out and can fail in such a way that they become a check valve.
__________________
2014 ML350 Bluetec (wife's DD)
2008 E320 Bluetec (my DD)
2008 ML320 CDI (Older son's college DD)
1998 E300DT (Younger son's college DD)
1987 300TD sold to vstech
----------
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
Reply With Quote
  #11  
Old 03-26-2014, 10:54 PM
Registered User
 
Join Date: Aug 2012
Location: Jacksonville, Florida
Posts: 39
Thanks, folks!

So I'll try releasing the pressure at the MC and seeing if that works this weekend. I'll give an update then.
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 10:17 PM.


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