Golferdad

This is on 1981,I’m putting new pads on fronts,and putting O rings in calipers,as they still have seals in them,guestion is working on passenger side and I only took two springs off,in other words just half caliper,shouldn’t their be four springs,or the springs are just on the one half. Thanks

interpon

4 springs
someone probably forgot to put in.
A nice write up

https://www.corvettemagazine.com/196...d-replacement/

69L88

Do you know that the O-ring seals take a different piston than the lip seals?

Rescue Rogers

No directions from the supplier? My CSSBINC kit came with new everything, all i reused was the caliper shells themselves

Bikespace

The CSSB Inc. kit may cost a bit more, but it comes with new pistons, and springs, Buy the high-heat version if you go that route.

https://www.cssbinc.com/corvette-bra...rsion-kit.aspx

Pboyd

[QUOTE=Bikespace;1607430408]The CSSB Inc. kit may cost a bit more, but it comes with new pistons, and springs, Buy the high-heat version if you go that route.

https://www.cssbinc.com/corvette-bra...rsion-kit.aspx[/QUOTE

Don’t buy the red silicone o-ring ( high temp) kit if you want to use silicone fluid. It will fail quickly. The regular kit will probably be ok with silicone fluid despite the warrantee warnings.

Golferdad

I ordered the kits,but I think one of the kits was missing the springs,but they come with 4 new pistons,4 O rings,and 4 dust seals.but will just use 2 of the old springs.

4-vettes

[/QUOTE

Don’t buy the red silicone o-ring ( high temp) kit if you want to use silicone fluid. It will fail quickly. The regular kit will probably be ok with silicone fluid despite the warrantee warnings.[/QUOTE]


Nope, it's not. I went down to the bearing and seal shop and purchased new O rings that are compatible with Dot 5. (Viton, which doesn't like Dot3 or4) I used their pistons, just purchased different O rings. I ran a thread on this , I think less than a year ago. I like my DOT 5.

Golferdad

Yea,according to the assembly manual,it says use a little silicone at bottom of piston in groove,which I guess why at the bottom of the calipers looked like jell after all these years.

WESCH

Hi.

Did you also replace the seals in the master cylinder for the conversion to DOT5 ? Unfortunately, I can't find your thread.

Brgds

4-vettes

Try this link.
https://www.corvetteforum.com/forums...conundrum.html
The master cylinder, and most brake parts on most every car out there have no trouble with DOT 3,4 Or 5.
most all rubber brake parts are made of EPDM type rubber. The makers of these O ring caliper kits wanted O rings that didn't have the seam on the outer edge. Look at the ones in your O ring kit. The moulding seam is about 20 - 25 degrees off the outer and inner edge. In order to have these O rings made this way. They obviously went offshore. And the rubber is a compromise. It is fine for use with Dot 3. But not tolerant of silicone.

Bikespace

That's a great link. I don't have anything to add here that wasn't there.

If your O-ring kit manufacturer tells you not to use DOT 5, don't. If you then source alternate O-rings to try to find something that is DOT 5 compatible, you are doing so at your own risk, but that thread has some information to get you started. I'll keep using the new O-rings, DOT 4 fluid, and doing periodic fluid changes.

bruiser

My O-ring caliper is still working with DOT 5

Pboyd

Buying your own o-rings to replace the ones in the kits is a good idea. The best o-rings for DOT5 silicone fluid are peroxide cured EPDM. You can buy them from theoringstore.com for $1.67 each for the larger front pistons. The alternative is regular sulfur cured EPDM. They are half the price but have a lower temperature resistance. I think reputable master cylinder kits use regular EPDM seals which will be OK with silicone fluid since the master cylinder has no heat issues.