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Old 09-21-2011, 02:49 PM
BRM BRM is offline
I need an older car
Join Date: Aug 2011
Location: Charlotte North carolina
Posts: 90
Caliper O-rings

In rebuilding the front calipers on my 300 it was only after I split the calipers and threw out the old rubber components that I discovered the rebuild kits do not include the o-ring that sandwiches between the caliper halves.
My search for replacements have resulted in a lot of "these might work" or "you can try these". Does anyone know of a source for correct replacement seals?

thanks in advance
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Old 09-21-2011, 06:05 PM
teezer's Avatar
ex minutiae manager
Join Date: Sep 2007
Location: ohio
Posts: 159
those are the hen's teeth of calipers, not available anywhere

had to deal with non available replacement calipers years ago and used an air conditioner o-ring which did work ~~~ how long ??

1989 300ce smoke silver / brazil, in a constant state of flux ~~~
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Old 09-24-2011, 09:16 PM
Tony H's Avatar
Join Date: Oct 2005
Location: Bandon, Oregon
Posts: 1,052
I think these kits have the correct O-rings but you have to buy the kit just for the o-rings since they are for a 914. let us know if they are correct.

Porsche 914 Brake Hydraulics - Page 3
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-Dad bought new
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Old 09-26-2011, 05:14 PM
BRM BRM is offline
I need an older car
Join Date: Aug 2011
Location: Charlotte North carolina
Posts: 90
I picked up some 0 rings from a local Pirtek. they manufacture custom Hydraulics and brake line. they are made form the proper material and seem to have sufficient crush to form a proper seal. I guess I'll find out,, I'll post my results here when I'm done.

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Old 09-26-2011, 08:13 PM
DeliveryValve's Avatar
Chairman of my Benz
Join Date: Jun 2006
Location: Central California
Posts: 4,132
This outfit has them, for like 2 dollar a piece.

Performatek - Home

You'll have to e-mail or call them for production info.

The warning here is Mercedes never intended for the calipers to be split by anybody other than a caliper rebuilding facility. That is why the seal kits do not include those seals.

1983 123.133 California
- GreaseCar Veg System

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Old 09-30-2011, 05:36 PM
BRM BRM is offline
I need an older car
Join Date: Aug 2011
Location: Charlotte North carolina
Posts: 90
the o-rings from Pirtek work great so far after a day of driving.
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Old 10-01-2011, 01:18 AM
Join Date: Oct 2011
Posts: 4
C-3 rear calipers are notorious for "pumping air" into the hydraulic system. This can occur if the rotor run-out is out of spec, or if there is a bearing issue. Vette Brakes offers a kit that will allow you to rebuild your calipers with O-rings. They are not available from Nissan and previously could only be found used. We now have these in stock and are available for the front or rear claipers or in a complete set for all 4 calipers.
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