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Old 04-24-2013, 06:04 PM
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Join Date: Apr 2013
Location: Miami, FL
Posts: 84
w109 6.3 Calipers on a 4.5 Rear Axle?

hi guys, I am new to the MB world and this forum. Just wanted to know if the rear brake calipers from a W108/9 6.3L would fit on the rear axle of a W108/9 4.5L V8.

I am putting the 4.5 axle in my W110 230 which has a disc / drum setup. Where is the pro portioning valve that I need to remove or change for disc / disc use?

Thanks much.

randy - Miami, FL

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Old 04-25-2013, 12:30 AM
cth350's Avatar
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Join Date: Dec 2000
Location: Long Island, NY
Posts: 3,877
vented rotors or not vented rotors. That is the question. Older 6.3's had vented rear rotors. The calipers for those won't fit on anything else. The later ones had solid rear rotors and should be the same as the other 108/109 v8 cars. You can confirm that with a free online registration of the US EPC.

But if you have a 4.5 rear, didn't it have calipers?

If searching here didn't find any threads on the disc brake upgrade for the W110/W111 cars, try the sl113 dot org forum. It's also a popular upgrade for the 230sl.

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Old 04-25-2013, 06:51 AM
GGR GGR is offline
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Join Date: Nov 2008
Posts: 1,067
Also piston diameter may be different. I remember notocing that so you should check is as it may alter brake balance between frnt and back.
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Old 04-25-2013, 08:04 AM
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Join Date: Apr 2013
Location: Miami, FL
Posts: 84
Hi guys, thanks for your responses.

The calipers on the 4.5 rear axle (and car) are rusty, but the JY also has a 6.3 rear axle that has some "silver" calipers. Not sure if these are new, aluminum, or silver paint, but they look fantastic. Both rears have solid non-vented rotors.

The 4.5 is in a car, VIN available, but the 6.3 is in a pile of axles.
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Old 04-30-2013, 09:37 PM
Tony H's Avatar
Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 1,234
You should grab the 6.3 axle-they are sought after.
Tony H
111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
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Old 05-02-2013, 11:50 AM
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Join Date: May 2006
Location: Atlanta, GA
Posts: 293
It should be noted that the vented rotors for the early 6.3s are available again (per Tom Hansen at the MB Classic Center in CA). Referenced in the following:

All the best,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabrio
1987 560SL
1990 560SEL

Last edited by JPMOSE; 05-02-2013 at 09:18 PM.
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