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Unobtainium o-ring seals used in Brembo calipers

Shane

Shane

Tuned and Synch'ed
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Nov 20, 2008
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Amici,

I'm rebuilding my Brembo 5165 (4-pot "Gold Line") calipers. I ordered seal and piston kit from TAW and discovered that this kit does not contain the o-ring seal between the caliper halves. TAW did a thorough search for me and found that only the Brembo kits for 2-piston calipers (e.g. F08/F09) contains the o-rings that fit between the caliper halves.

I can order appropriate-sized o-rings from McMaster Carr, but would like to know what these o-rings are made from. Vitron perhaps? Neoprene?

I'd hate to buy a seal that rots in brake fluid. Anyone know what does not rot in brake fluid?

I'll call the Good Guys at MGCycle.

Shane
 
Shane, when Brembo USA was still open here in my backyard, they told me that they did not offer rebuild kits in the U.S. -- Clearly they are available elsewhere. So you are saying the o-rings did not come in the kit, huh. Let us know what you learn from the guys at MGCycle, or also try Agostini in Mandello direct; assistenza at agostiniduilio.com
 
Re:Unobtainium o-ring seals used in Brembo caliper

Do you have 5165 (1-pin) or 6800 (2-pin) calipers? I had some kits for the 5165s. There never has been kits for the 6800s.
 
I called Gordon @ MGCycle, but they had closed for the day. I'll call again tomorrow.

I found this table on o-ring material properties at McMaster-Carr:

There appears to be a number of materials that are resistant to both brake fluid and temperature (e.g. FEP and PTFE), but these materials are not black, and they have very special markings INSIDE the clear coating. I suspect that Brembo uses Buna-N 'cuz it's cheaper. Also, McMaster-Carr only stocks FEP and PTFE in SAE sizes; the only metric o-rings they have are in Buna-N. I'm not implying that Brembo sources its materials from McMaster-Carr, but if McMaster-Carr does not have it, then it probably does not exist (outside
of a DoD or NASA top-secret lab).

Poking around the web, BMW advises that the reason why they do not supply the o-ring in their rebuild kits (Brembo manufactures the 5165 for BMW) is because they do not advise splitting the caliper halves. Funny, because Brembo provides no such warning.
 
Re:Unobtainium o-ring seals used in Brembo caliper

So you have 5165s, then? That's good because even the piston seals in the 5165 kit will not work in the 6800s. Our shop tired rebuilding a 6800 a m0nth or so ago. Didn't work. Fortunately, the calipers aren't horribly expensive.

Nevertheless, keep your Brembos healthy by avoiding DOT 5.1 fluids . . .
 
In most of our aircraft hydraulic applications, the material is buna-n including skydrol and standard milspec red oil
 
guzzi jon wrote:
In most of our aircraft hydraulic applications, the material is buna-n including skydrol and standard milspec red oil
Click to expand...

I don't need to tell you, but in case others don't know.. aircraft hydraulic fluid is a completely different animal.
 
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