brake caliper seals - o-rings now? 2

[Tmoose]

some Corvette specialists are supplying 0-rings seal as the primary pressure seal for disc brake calipers. Unfortunately they are referring to the OEM seal as a "lip" seal. I would describe it as a square or rectangular section O-ring, but not a lip seal. Anyhow, I believe all the calipers I've worked on (Volvo, yamaha motorcycle, various Ford, Mopar and GM of the 70s and 80s) have used square section rings.

Are o-rings really used in brake calipers (since 1982)?

http://www.cssbinc.com/images/ads/howto/frontbrakecaliperrebuildinstructions.pdf

thanks

Dan T

 

[thruthefence]

Apples & oranges, of course, but I have never seen an aircraft brake with anything OTHER then a round cross section standard o-ring. Duty cycle maybe?

 

[patprimmer]

Somewhere I missed the 1965 part and saw it as a mid 80s part, hence my disbelief.

I to have now learned something, even if only, early Corvette had crumby calipers.

Regards
Pat
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[gruntguru]

One point that knowledgeable posters have omitted and others may not be aware of:

The groove in a typical caliper is in the bore - not the piston. So when the square-section ring sees fluid pressure, it moves in the same direction as the piston (towards the disc) and due to distortion of the seal, actually slides along the piston slightly. So when the pressure is released, the seal returns to its original shape and carries the piston that small distance - away from the pad.

Engineering is the art of creating things you need, from things you can get.

 

[patprimmer]

Lionel.

Both Jaguar and Citroen had disc brakes for 10 years before that. There may have been others, but while discs where rather novel in 65, they where not all that new, but I can see where aircraft technology was transferred and new problems not apparent in aircraft application came to light.

Regards
Pat
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[swall]

Studebaker had disc brakes in 1962. They were Dunlop design, made by Bendix under license.

 

[patprimmer]

swall

I think that is what Jaguar and Citron had as well.

Of course bicycles had them for years before that. They used the rim as the rotor.

Regards
Pat
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[thruthefence]

Not sure that these are "disc brakes" in the current sense of the word, but the 1950 Chrysler Imperial had these for an option:

http://www.imperialclub.com/Repair/Brakes/lambert.htm

 

[thruthefence]

As an amendment to the Chrysler brake post, here's an exploded view, if anyone's interested:

http://i1204.photobucket.com/albums/bb405/thruthefence/scan0003oldchryslerbrakes.jpg

 

[swall]

Interesting. Vaguely similar to an aircraft brake, although it is not clear how these are actuated.

 

[evelrod]

TTF, I love this forum. Seldom a day goes by that I don't learn something new, even at my age. I'm so much smarter today than ten years ago that I'm considering going back into the business world..........Naw. Just kidding. ;-) I may be a bit on the slow side, but not totally stupid.

I'm going to Auto Aid and spring this Chrysler brake on my unsuspecting parts guy. He's hard to trip up. Bet this will do it.

Rod