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w126 first gen on a w123
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MTUPower Offline
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Post: #1
w126 first gen on a w123
MB w123's ) all have solid rotors. I've had two cars that had small issues with the calipers sticking and then the fluid "boiled" and I had excessive brake fading. That can be scary. I've found out that the first gen w126 (280se/l, 380se/l and 500se/lEDIT- and on the 300sd) calipers and rotors can be swapped directly into a w123- it's plug and play. You must swap both the calipers AND rotors. You will not get more braking power but the w126 is vented and the w123 is solid- so you will have more cooling- less chance of brake fading....

Here is the w123 rotor

[Image: N100016089BAL.JPG]

and here is the w126 rotor[Image: N100016595BAL.JPG]
Better braking is needed when you have more HP.... Wink

1984 300TD Myna IP/underhood IC/altered boost/AAZ's-265's@150bar/w126genII brakes-wheels/vogtland springs/egt-boost gauges....and more to come.
03-01-2008 10:13 PM
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ForcedInduction Offline
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Post: #2
Re: w126 first gen on a w123
It is also found on the Diesel W126 models.
03-02-2008 05:11 AM
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TheDon Offline
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Post: #3
Re: w126 first gen on a w123
Plus you do have a wider option of brake discs. Brand wise (Brembo), as well as cross drilled and slotted.

I discovered this when my parts guy sent me W126 discs by accident(they were brembo's.. but a name is a name)
03-02-2008 10:11 PM
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ForcedInduction Offline
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Post: #4
Re: w126 first gen on a w123
If you don't want to go the used parts route, you can order rebuilt calipers and new rotors and use your old calipers for the core charge.
03-03-2008 06:53 AM
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winmutt Offline
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Post: #5
Re: w126 first gen on a w123
IIRC later 126's a slightly larger disc was used. IIRC, the last year W126 500 series had some a lighter caliper as well.

This upgrade is one of many on the list for me to do.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
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03-03-2008 05:38 PM
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winmutt Offline
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Post: #6
Re: w126 first gen on a w123
Have you guys seen the newer ATE discs? They have a "wear detector" that is basically 2 rounded squares grooved into the surface. Practically slotted. I will probably go with the ATE unless I upgrade to the vented.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
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03-15-2008 11:19 PM
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TheDon Offline
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Post: #7
Re: w126 first gen on a w123
another cool option is with the bigger(later gen) w126 brakes you also have the option of Zimmerman cross drilled rotors...
03-16-2008 12:11 PM
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pgringo Offline
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Post: #8
Re: w126 first gen on a w123
i would not go with cross drilled. they are prone to cracking. even high dollar cross drilled end up cracking. i know a porsche club track racer who claims to have seen many. slotted and maybe cryo hardened is the goods.
03-17-2008 02:41 AM
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winmutt Offline
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Post: #9
Re: w126 first gen on a w123
pgringo Wrote:i would not go with cross drilled. they are prone to cracking. even high dollar cross drilled end up cracking. i know a porsche club track racer who claims to have seen many. slotted and maybe cryo hardened is the goods.
Slotted are available as well iirc.

1987 300D Sturmmachine
1991 300D Nearly Perfect
1985 300D Weekend/Camping/Dog car
1974 L508D Motoroam Monarch "NightMare"
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03-17-2008 08:39 AM
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dropnosky Offline
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Post: #10
RE: w126 first gen on a w123
Are the 126 calipers a piston on either side as well? using the same principle as the 123, or do they use a slide?

1974 240D 4-speed
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1987 VW Quantum wagon 5-speed
04-22-2009 09:54 PM
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kamel Offline
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Post: #11
RE: w126 first gen on a w123
AFAIK, they are the same as the 123, just larger. It has been over 8 months since I seen my calipers.

'78 300D, OM617.912: 4spd manual, TB03 at 10PSI, 26*BTDC, DV's turned, HVAC, emissions system removed, e-fan, short ram, 3" downpipe to straight exhaust, W126 Bendix brakes, MR2 Spyder seats. 2890lbs
04-23-2009 01:11 AM
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dropnosky Offline
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Post: #12
RE: w126 first gen on a w123
Aha! I see. This sounds like a great upgrade, especially since I am kind of experiencing the same kind of brake fade.

This may sound ridiculous, but several times I have read the word AFAIK on this forum and for some reason, assumed each time it was someones name!

Now I know better.

1974 240D 4-speed
1989 Chevy Astro
1987 VW Quantum wagon 5-speed
04-23-2009 08:31 PM
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Motorhead Offline
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Post: #13
RE: w126 first gen on a w123
I just found a '86 126 in the junk yard, it is a 420 and it is all there. How much of the brakes should I use from it, calipers/rotors & lines and anything from the rear? Hey does it have a LSD that I could use in my CD, if I didn't have 15" and 16" rims I would get the 15" chrome rims off of it.
08-19-2009 06:07 PM
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DeliveryValve Offline
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Post: #14
RE: w126 first gen on a w123
(08-19-2009 06:07 PM)Motorhead Wrote:  I just found a '86 126 in the junk yard, it is a 420 and it is all there. How much of the brakes should I use from it, calipers/rotors & lines and anything from the rear? Hey does it have a LSD that I could use in my CD, if I didn't have 15" and 16" rims I would get the 15" chrome rims off of it.

That's a 2nd Generation W126. They have bigger rotors. So you'll need to get the spindle/steering knuckle, rotors, backplate and calipers. Maybe the lines if they look new.

The 420 didn't come with a LSD. Plus since it is 2nd Gen w126, it will not be a direct bolt in.

Surfrodder just recently installed his, so he'll be good to get more info from.

Gota love Mercedes Diesels!



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08-19-2009 06:47 PM
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ForcedInduction Offline
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Post: #15
RE: w126 first gen on a w123
(08-19-2009 06:47 PM)DeliveryValve Wrote:  So you'll need to get the spindle/steering knuckle, rotors, backplate and calipers. Maybe the lines if they look new.

You shouldn't need the spindles. Just the rotors, calipers and back plate.

You'll also need at least 15" wheels for them to fit.
08-19-2009 06:56 PM
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willbhere4u Offline
do the interns get glocks?
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Post: #16
RE: w126 first gen on a w123
I think the backing plates are the same at least they where on my w123 and w116

1987 300SDL soon to be 6spd______6cyl 6spd
1985 300td euro 5spd wagon ______5cyl 5spd
1980 240D 4spd Rajay turbo kit_____4cyl 4spd
1964 220S
08-19-2009 07:29 PM
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DeliveryValve Offline
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Post: #17
RE: w126 first gen on a w123
(08-19-2009 06:56 PM)ForcedInduction Wrote:  
(08-19-2009 06:47 PM)DeliveryValve Wrote:  So you'll need to get the spindle/steering knuckle, rotors, backplate and calipers. Maybe the lines if they look new.

You shouldn't need the spindles. Just the rotors, calipers and back plate.

You'll also need at least 15" wheels for them to fit.

My Bad, I meant to add that if you want to have ABS you would keep the spindles. W123 and W126 should be same.
(08-19-2009 07:29 PM)willbhere4u Wrote:  I think the backing plates are the same at least they where on my w123 and w116

There have been reports the back plate rub with the bigger rotors.

Gota love Mercedes Diesels!



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(This post was last modified: 08-19-2009 08:25 PM by DeliveryValve.)
08-19-2009 08:24 PM
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ForcedInduction Offline
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Post: #18
RE: w126 first gen on a w123
(08-19-2009 07:29 PM)willbhere4u Wrote:  I think the backing plates are the same at least they where on my w123 and w116
For the wider genI W126 rotors they are, but Motorhead got a set of larger diameter genII brakes instead.
(This post was last modified: 08-19-2009 08:58 PM by ForcedInduction.)
08-19-2009 08:58 PM
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willbhere4u Offline
do the interns get glocks?
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Post: #19
RE: w126 first gen on a w123
ah ok makes seance good to know!

1987 300SDL soon to be 6spd______6cyl 6spd
1985 300td euro 5spd wagon ______5cyl 5spd
1980 240D 4spd Rajay turbo kit_____4cyl 4spd
1964 220S
08-20-2009 11:36 AM
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Motorhead Offline
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Post: #20
RE: w126 first gen on a w123
Cool, I guess I will be in Pic-a-part on Sunday morning. I also seen a N/A '79 300 with a center inlet long runner intake, I have to stick to basics right now and get my pile going.
Hey what gear ratio do you think would be in that 420, can I just R&R the pig and stuff my stock axles in it?
(This post was last modified: 08-20-2009 08:53 PM by Motorhead.)
08-20-2009 08:48 PM
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