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 02-22-2007, 05:39 PM
1982 240D
 
Join Date: Sep 2005
Location: Winston and Salem, North Carolina
Posts: 32
Stuck Brake Caliper-HELP!

I've got an 82 240D. I was changing my brake pads, and found leaking pistons on the left caliper. The new calipers came today (I decided to replace them rather than fool w/ rebuilding them), and I started to remove the old calipers.

That's where my problem is.

I can not for the life of me get the mounting bolts broken loose. I've managed to bend the shaft of my socket wrench w/ a cheater pipe but the bolts are still tight.

Any suggestions as to how to break these things loose?

I'll see if I can borrow a torque wrench from a friend, in hopes that I can get them loose...

Any help would be most appreciated!

Reply With Quote
  #2  
Old 02-22-2007, 05:49 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,122
Do not use a torque wrench to loosen. You will ruin it.

Try some PB Blast and an impact wrench. You can also tap the bolt pretty firmly with a 3-4 lb sledge, or use a manual impact wrench as well. Heat can also be a good thing, and long as you stay away from the rubber parts.
__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 133K miles-replaced the other '06 that quit after 300k miles. (did not catch the bad cam in time)

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

90 Dodge D250 5.9 Cummins/5 speed. 400K
Reply With Quote
  #3  
Old 02-22-2007, 05:51 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
If you borrow a torque wrench from a friend and use it to remove those cap screws, you'll no longer have the friend anymore.

You need an 18" breaker bar and about 100 lb. of force to crack them loose. Try not to use an extension on the socket as there is a tendency for the socket to rotate off the fastener when a large torque is applied.

The job is much more likely to succeed if 1/2" tools are utilized.
Reply With Quote
  #4  
Old 02-22-2007, 08:28 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,937
Quote:
Originally Posted by Tree Frog View Post

I'll see if I can borrow a torque wrench from a friend, in hopes that I can get them loose...
Make friends with someone with an impact wrench. And with any luck, she will come over and help you.
Reply With Quote
  #5  
Old 02-22-2007, 09:20 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,163
Quote:
Originally Posted by Brian Carlton View Post
If you borrow a torque wrench from a friend and use it to remove those cap screws, you'll no longer have the friend anymore.

You need an 18" breaker bar and about 100 lb. of force to crack them loose. Try not to use an extension on the socket as there is a tendency for the socket to rotate off the fastener when a large torque is applied.

The job is much more likely to succeed if 1/2" tools are utilized.
this should work. be sure to keep the socket square on the bolt head and all the way on.

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #6  
Old 02-22-2007, 10:14 PM
crashone's Avatar
1983 300SD, 4 speeed
 
Join Date: Jul 2006
Location: Raleighish, NC
Posts: 664
You can also try a 2-3lb hammer on the end of a box wrench. Slip the box on the bolt (19mm) and keep pressure against it to keep it from coming off then smack the wrench. Use some PB type stuff as mentioned.
__________________
If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon
Reply With Quote
  #7  
Old 02-23-2007, 07:22 AM
Ara T.'s Avatar
Registered User
 
Join Date: Sep 2004
Location: Santa Rosa, CA
Posts: 2,075
Wow I'm amazed at how lucky I was when I did my calipers. I was able to get my caliper bolts off with my 3/8" socket wrench. Took a lot of muscle but it cracked open. Then to make it easier on myself I got a foot breaker bar and it was a piece of cake. And yes they did have that blue locktite on em...at first I thought a previous owner hadn't torqued them properly.
__________________
1985 CA 300D Turbo , 213K mi
Reply With Quote
  #8  
Old 02-23-2007, 10:27 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,518
Hmm, I thought they were 17mm, anyway, pressure will make it very hard to remove, impact is the key! if you have the wrench solid on the bolt, 6point socket or box end wrench is best, a solid whack from a ball peen hammer should pop the bolts loose. PB blaster won't help much, maybe a little for the rust on the surface of the bolt head, but it's just the locktite holding it still, impact will fix it, unless a PO (dumb PO that is...) put RED or GREEN locktite on. then Heat is the only way to remove. the problem with that is the caliper is in the way of getting the heat where it needs to be... you have to heat the socket threads, not the bolt.
good luck, I hope it's not red...
John

__________________
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
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 06:49 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, 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