DOT5 Compatible Assembly Lube

[spits]

Greetings
I'm interested in thoughts on assembly lubes compatible with DOT5 brake fluid, ie silicone based. I understand that one OEM who spec'd DOT5 for awhile (Harley-Davidson) recommended NovaGard Versalube 322L but that's second hand info and why that formulation? What other lubes have worked / will work?
Please note: Not interested in turning this into a pro/con on DOT5 vs glycol fluids. That decision's been made!
Thanks in advance!
Paul

 

[Trav]

I just use DOT 5 brake fluid to assemble rubber parts in a DOT 5 system, it works fine. You can use Sil-Glyde if you want a thicker paste.

Quote:
Sil-Glyde Brake Lubricant is a silicone-based brake lubricant recommended for the entire brake assembly, is compatible with plastic and rubber (EPDM & Nitrile), and dampens vibrations between contact points

 

[doitmyself]

Originally Posted By: Trav
I just use DOT 5 brake fluid to assemble rubber parts in a DOT 5 system, it works fine. You can use Sil-Glyde if you want a thicker paste.

Quote:
Sil-Glyde Brake Lubricant is a silicone-based brake lubricant recommended for the entire brake assembly, is compatible with plastic and rubber (EPDM & Nitrile), and dampens vibrations between contact points


Hey Trav,

We've had numerous discussions before indicating that Sil-Glyde is not a true silicone product like the Dow and 3M brake/dielectric greases. The old Sil-Glyde msds's showed it to contain castor oil, polyethylene glycol, and just a bit (7-13%) of some type of silicone/silica component. https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2991445

I wonder if it safe for the DOT 5 application?


Edit: here's the old msds: https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=18&cad=rja&uact=8&ved=0ahUKEwjv96DmterTAhVo44MKHZ9uCGA4ChAWCEwwBw&url=http%3A%2F%2Fweblink.carquest.com%2Fmsds%2FCANADA%2FAGS%2FAGS%2520BK-4.pdf&usg=AFQjCNE0YsW55XPQ-4ZPuXqLdv0ikjWkdQ

Newer sds showing castor oil as the main ingredient: http://www.qualitydist.net/agss-sg4.html

 

[Trav]

They claim its compatible with EPDM rubber which is what brake parts are made from. Castor oil and polyethylene glycol are not an issue with EPDM either.
If there is a question about compatibility I would just call their tech support. Here are a couple of compatibility charts..

http://mykin.com/rubber-chemical-resistance-chart-5

http://www.fbs-online.com/Centre/Prod/EPDM-chem-com-res.htm

Edit: Its not a bad idea to flush the brake system after it has been in service a short time after repairs or assy so its not a big deal it will be flushed out anyway.
You don't want any additional thickeners from the assy lube in the brake fluid permanently.

 

[spits]

Thanks for the inputs. I am looking for something with more body than the fluid itself. I'll take another look at Sil-Glyde. I also have some 100% silicone grease for dive reg parts. It's dimethylpolysiloxane which is the major constituent in DOT5 so that would seem compatible.
Best
Paul

 

[Silk]

Seiken PL-7S, it's silicon based.