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  #1  
Old 05-30-2007, 12:45 AM
Dex Dex is offline
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Brake replacement on a 85 300SD

I've not replaced a lot of brakes, but even worse, I've not done one on my Benz yet. I've got to replace the pads and rotors all around (may have to replace on caliper altogether. We'll see when I get the baby off), and at least one sensor on my '85 300SD. So, naturally, I'm looking for instructions, links, advise...anything I can get my hands on.


Any help for the new guy?

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  #2  
Old 05-30-2007, 12:59 AM
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Since they are four wheel disc brakes, it is really pretty easy. The Haynes manual (for the W123 series) has a pretty good explanation. But if you've done disc brakes before, on other cars, you should have no problems.

Also check out the DIY links. At the top.
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Last edited by SD Blue; 05-30-2007 at 01:07 AM.
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  #3  
Old 05-30-2007, 01:11 AM
Dex Dex is offline
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Thanks, I'll grab that. Never can have too much reference material.

That brings up a rabbit trail question that has bugged me for awhile. Why are there manuals for the 123 and not the 126? I'd give my right arm (or at least my custom made valve adjustment wrenches) for one.
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  #4  
Old 05-30-2007, 07:20 AM
t walgamuth's Avatar
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higher production?

the fsm for the 126s is really good. many of the mechanical parts are the same on the 126 as on th 123. a huge amount of mechanical part sharing between the two chassis.

both are excellent and mechanic friendly.

the brakes are the easiest to work on of any car i have owned.

tom w
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  #5  
Old 05-30-2007, 09:20 AM
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Quote:
Originally Posted by t walgamuth View Post
higher production?

the fsm for the 126s is really good. many of the mechanical parts are the same on the 126 as on th 123. a huge amount of mechanical part sharing between the two chassis.

both are excellent and mechanic friendly.

the brakes are the easiest to work on of any car i have owned.

tom w
EXCEPT for those blasted 10mm allen head bolts holding on the rotor!
most other cars, just put the rotor over the lug nuts, and let them hold it on... other than that, they are indeed simple to work on.
John
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  #6  
Old 05-30-2007, 10:34 AM
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if brakes are draging or hoses look suspect
replace the hoses too

and even if the calipers are not changed
bleed out the old fluid once a year
or every time you work on the brakes
as old fluid is a prime cause of sticking leaking calipers and masters
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  #7  
Old 05-30-2007, 11:45 AM
rrgrassi's Avatar
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A little heat on the rotor, near the bolts will also soften the loc-tite.
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  #8  
Old 05-14-2012, 03:57 PM
Flawless
 
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Location: Buffalo, New York
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Rear Brake Rotors / '82 126 300SD / 10 mm allen screw

Does a 1982 300SD use a 10 mm Allen Screw to secure the rotors, or is this present in the '85+SDL only.

Visited my rotors a few weekends ago and could not get them off.

Emergency brakes function fine, and hold at 3 clicks.

Just put on new brake pads, and brake hose.

However, I could not get my rotor's off. The fitting that I saw, may have been an allen screw seemed to be devoid of any flat surfaces that might allow an allen wrench any purchase?

I backed away from the task until I had more information.

Advice please!
Attached Thumbnails
Brake replacement on a 85 300SD-photo4.jpg   Brake replacement on a 85 300SD-photo2.jpg   Brake replacement on a 85 300SD-photo%5B1%5D.jpg  

Last edited by mccauleybil; 05-14-2012 at 05:16 PM. Reason: Adding Photo's
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  #9  
Old 05-14-2012, 11:12 PM
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No, no screw on the rear rotors, you'll need to make sure the e-brake is off, then tap in strategic areas, should come off.

Dex, the front rotors are held on with a split nut. You'll have to re-install the outer bearing.
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  #10  
Old 05-14-2012, 11:23 PM
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Quote:
Originally Posted by toomany MBZ View Post

Dex, the front rotors are held on with a split nut.
Do you really think Dex has been waiting for that information…for five years?
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  #11  
Old 05-14-2012, 11:28 PM
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How about the bolt and washer at the center of the hub? Does it need to come off?
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  #12  
Old 05-14-2012, 11:30 PM
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Quote:
Originally Posted by mccauleybil View Post
How about the bolt and washer at the center of the hub? Does it need to come off?
Assuming tha that the question refers to the rear brake rotor, no. You don't want to touch that screw.

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