STD
123 brake upgrade to 126 2nd Gen - Printable Version

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+--- Thread: 123 brake upgrade to 126 2nd Gen (/showthread.php?tid=2550)

123 brake upgrade to 126 2nd Gen - makin' smoke - 04-24-2011

Due to the fact that there is no dedicated thread to the w126 2nd gen brake conversion on a 123; i figured i'd post one with pics.

Needed for convert:
-Rotors
-Calipers
-Backing plates
-15" or larger wheels

Stock solid 280mm w123
   
Unbolt caliper and remove rotor
   
Remove backing plate. perfect time for clean and paint.
   
Now time to reassemble. Remember your locktite. If it had it, put it back.
   
If you went the pick-a-part route, you might need/want to do some cleaning and painting. I did, and used caliper paint. It required a bake hardening process. When pulling the calipers at the yard i cut the hoses at the caliper fitting, installed a screw in the open hose to plug off for cleaning/painting. Otherwise a set of pipe plugs would be required.

Once the rotor was installed, (cleaned, painted, wheel bearings cleaned and repacked) I installed caliper and mounted. To limit the amount of spillage and lose of brake fluid, i left the old caliper hose attatched until the new caliper was installed. At this point the line must be removed to unthread from old caliper and rethread into new caliper. They use the same part pad, transfer or install new pads. Note:dont forget to get the pad springs and pins.
   
After 100 bucks, a trip to the yard and a saturday fooling around making the conversion, Totally worth it! More responsive, aggressive feel.




RE: 123 brake upgrade to 126 2nd Gen - Greazzer - 04-24-2011

VERY NICE,

Do you have a list of cars which make good donors ? Is the back brakes easy also?

Thanks for the info.

Please share.

RE: 123 brake upgrade to 126 2nd Gen - makin' smoke - 04-24-2011

86' and up w126 chassis should all have the 300mm brakes. The rears are the same, solid disc and same diameter. I am not sure about the coupe versions of the 126. I believe they used the same rotor but used a "floating" caliper. You would have to use different pads. Also the w126 with 2nd Gen brakes used a different master cyl. Possibly because of the ABS/ASR system. The pistons in the w126 2nd Gen calipers are the same as the stock 123. Guaranteed cross application. Not sure if the floating calipers have the same displacement which could mess with the proportioning of the brake system.

RE: 123 brake upgrade to 126 2nd Gen - willbhere4u - 04-24-2011

Also be ready to measure your wheels to make sure they fit over the new breaks! ask how I know this!

RE: 123 brake upgrade to 126 2nd Gen - fha772 - 08-04-2011

Hi, I'm planning to do this next week, i have 1 question though.

Do you use the W123, W126 brake hoses?

I want to order some braided hoses to fit while I'm doing it.

Cheers Frank.

RE: 123 brake upgrade to 126 2nd Gen - DeliveryValve - 08-04-2011

The w123 hose will fit the w126 caliper.


.

RE: 123 brake upgrade to 126 2nd Gen - fha772 - 08-05-2011

Thanks, I'll order my new hoses now!!!

RE: 123 brake upgrade to 126 2nd Gen - w123star - 09-30-2012

Thanks for the receipe
I'll do this to my OM606 W123 build Wink
Jens

(08-05-2011, 02:38 AM)fha772 Thanks, I'll order my new hoses now!!!


RE: 123 brake upgrade to 126 2nd Gen - sassparilla_kid - 09-30-2012

All I need is to pick up some pads before I can join the club

RE: 123 brake upgrade to 126 2nd Gen - 83300d - 10-14-2012

Found an 89 500 at the wreckers on the weekend, but have an 87 2.6 190e that I bought for the rims and wondered which of these have the bigger brakes for my 83 300d.

Sorry I didnt have time to search tonight so thought i would ask.

Thanks

RE: 123 brake upgrade to 126 2nd Gen - SpecialDelivery - 07-04-2013

Am I reading this right? You used junkyard calipers on this job? How did you prep them for paint? and did you bake them as well...did the seals stand up to the oven? or did you break them down after sanding and then cook and then put new seals?


Love to do this mod on my W123 as I'm due for brakes, I have a small sand blaster so I'm kind of thinking of pulling a set from the yard and getting a seal kit and having a go at it.

(04-24-2011, 12:43 AM)makin smoke Due to the fact that there is no dedicated thread to the w126 2nd gen brake conversion on a 123; i figured i'd post one with pics.

Needed for convert:
-Rotors
-Calipers
-Backing plates
-15" or larger wheels

Stock solid 280mm w123

Unbolt caliper and remove rotor

Remove backing plate. perfect time for clean and paint.

Now time to reassemble. Remember your locktite. If it had it, put it back.

If you went the pick-a-part route, you might need/want to do some cleaning and painting. I did, and used caliper paint. It required a bake hardening process. When pulling the calipers at the yard i cut the hoses at the caliper fitting, installed a screw in the open hose to plug off for cleaning/painting. Otherwise a set of pipe plugs would be required.

Once the rotor was installed, (cleaned, painted, wheel bearings cleaned and repacked) I installed caliper and mounted. To limit the amount of spillage and lose of brake fluid, i left the old caliper hose attatched until the new caliper was installed. At this point the line must be removed to unthread from old caliper and rethread into new caliper. They use the same part pad, transfer or install new pads. Note:dont forget to get the pad springs and pins.

After 100 bucks, a trip to the yard and a saturday fooling around making the conversion, Totally worth it! More responsive, aggressive feel.