Compatibility of DOT 5 with modern brake piston seals

[Gary B.]

Gary


Regarding DOT 5 compatibility, there are some recent, informative postings on the Corvette Forum that Jim Lockwood made me aware of, including this one:


https://www.corvetteforum.com/forums...ake-parts.html

[Terry M.]

Re: Compatibility of DOT 5 with modern brake piston seals

The brake caliper rebuilding parts seem redily available, but the master cylinder kits (either manual or power) seem to be unobtainable at this time.

[Gary B.]

[Terry M.]

Re: Compatibility of DOT 5 with modern brake piston seals

Thanks for the tip. I hadn't thought of that way.

[Bob I.]

[Gary B.]

Re: Compatibility of DOT 5 with modern brake piston seals

Bob,

Do your existing caliper pistons take lip seals? Or O-rings?

Gary

[Joe L.]

Re: Compatibility of DOT 5 with modern brake piston seals

Gary


Regarding DOT 5 compatibility, there are some recent, informative postings on the Corvette Forum that Jim Lockwood made me aware of, including this one:


https://www.corvetteforum.com/forums...ake-parts.html

Gary------

Given that DOT 5 brake fluid is compatible with a fairly large variety of brake system elastomeric materials I've got to wonder what is the other seal material the brake parts rebuilders use? And, how much cost can be saved by using seals of such material?

[Patrick H.]

Re: Compatibility of DOT 5 with modern brake piston seals

Gary------

Given that DOT 5 brake fluid is compatible with a fairly large variety of brake system elastomeric materials I've got to wonder what is the other seal material the brake parts rebuilders use? And, how much cost can be saved by using seals of such material?

Not only that, with as many as Lonestar uses and could likely sell, they could have them made with rubber that wouldn't be affected.
I would think that warranty costs for cheap seals would be higher than any difference in price.

[Gary B.]

Re: Compatibility of DOT 5 with modern brake piston seals

Gary------

Given that DOT 5 brake fluid is compatible with a fairly large variety of brake system elastomeric materials I've got to wonder what is the other seal material the brake parts rebuilders use? And, how much cost can be saved by using seals of such material?

Joe,

I initially thought it must be a cost issue. But as an example of costs, you can get a Raybestos lip seal kit for one rear caliper via Amazon Prime for $11.87. Muskegon Brake sells a rear lip seal kit for one caliper for $14.95. And the Muskegon kit might come with the DOT 5 warranty void disclaimer. So, I’m perplexed.

Gary

[Bob I.]

Re: Compatibility of DOT 5 with modern brake piston seals

Gary,
The calipers are lip seal, Lonestar rebuilt them approximately 10 years ago no leaks so far.
Bob

[Gary B.]

Re: Compatibility of DOT 5 with modern brake piston seals

Gary,
The calipers are lip seal, Lonestar rebuilt them approximately 10 years ago no leaks so far.
Bob

[Richard G.]

Re: Compatibility of DOT 5 with modern brake piston seals

Without any thought or knowledge of compatibility or sealing materials I rebuilt the brake system on an C10 truck using DOT5 fluid. This was over two years ago. I did have my share of leaks. Especially when incorporating stainless lines in the build but none were at the rubber sealing surfaces.
I have put over 500 miles on the truck and have had zero issues with leaking or function of the brake system.
Guess if luck it what it takes I have had some.

[Gary B.]