O-ring Calipers cure air problems?
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
O-ring Calipers cure air problems?
Changed the Disks and Calipers but did not shim about a month ago. Used original Lip seal calipers from SSBC. The system will get air into the brakes if driven. I know the rotors need to be shimmed, but with 150K on the rear bearings, some say end play in the rear spindles will cause the same problem, so shimming won't cure the problem. anybody have a like problem and go with O-Ring calipers as a fix and did it fix the air problem? Trying to deciede what rout to take on this. Don't really feel like pulling the rear trailing arms right now,, maybe in 6 mos when i get my working space together. Thanks,, C. 
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
bump
I don't theink the runout is that bad,, just bad enough to cause a problem with the lip seal calipers,, like I said,, I changed all 4 disks as well,, anything over 1/100 of an inch at 5 in from center will cause a problem, on just one.
I don't theink the runout is that bad,, just bad enough to cause a problem with the lip seal calipers,, like I said,, I changed all 4 disks as well,, anything over 1/100 of an inch at 5 in from center will cause a problem, on just one.
Last edited by RunningMan373; Sep 12, 2007 at 09:04 PM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Have you narrowed it down to 1 caliper? Whatever caliper has the air will be the culprit.Maybe you can get by by shimming that one.
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
No,, i've been lazy. the Cars been sitting and I've been sitting. I am starting to believe these cars force to completely restore them, before you get to drive them. Trying to figure on what route to take.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Your absolutely right.A big part of them have been driven without much mechanical attention.Most shops like to take them in for repairs but do more driving around than repairing because they dont have the patience or the expertise required for the C3.If money would have been spent more wisely on mechanical instead of paint the C3s as a whole would be in much better shape today."Pretty Sells"
Le Mans Master
Joined: Apr 2001
Posts: 5,000
Likes: 1
From: Minneapolis, Mn USA
If you get the O-ring conversion kit from VBP, it'll only set you back ~$150 and you'll be able to rebuild all 4 calipers yourself. Pretty cheap investment to see if this takes care of your issue.
Make sure your existing calipers are SS sleeved and in OK shape.
B...
Make sure your existing calipers are SS sleeved and in OK shape.
B...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Corvette & Porsche 911: How Two Icons Conquered the Last 25 Years
Joe Kucinski
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!
Michael S. Palmer
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
OK, this is what I am going to do, and set in motion. I got 2 rear O-ring calipers on order, and a full set of front wheel bearings, Timkins. I will change the front bearings and shim the rotors to near 0 run out,, then shim the rear rotors to the same and put the O-Ring calipers on the rears incase of excessive end play. Then power bleed through with my motive. That ought to cure it,, and make it drivable. 
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
OK, this is what I am going to do, and set in motion. I got 2 rear O-ring calipers on order, and a full set of front wheel bearings, Timkins. I will change the front bearings and shim the rotors to near 0 run out,, then shim the rear rotors to the same and put the O-Ring calipers on the rears incase of excessive end play. Then power bleed through with my motive. That ought to cure it,, and make it drivable.
I would like to add GM allows up to .008 end play.End play over .001,.002 or .003 does not increase runout it only makes it almost impossible to accurately check.A new axle between centers that indicates 0 on both bearing surfaces and the rotor flange- will be 0 runout when install in the car with good bearings whether it has .001 end play or .008 end play.Once again with .001 end play you can check it and prove it....with .008 you can't.
.......
Racer
Joined: Sep 2007
Posts: 286
Likes: 0
From: Pensacola Fla
VB&P "O"ring seals
Just my two cents,I am an original owner of a 79,L- 82 ,4 speed car and perform regular pm on it.With the brakes I would replace the stock lip seals,clean the bores,replace fluid(silicone)my preference .This was done on a yearly basis and the reason that started the vigilant process was leaking calipers.Three years ago I purchased an "O" ring seal kit from VB&P at the Orlando NCRS show/swap meet and this is the best mod I have done to date for me.My brakes have been trouble free,I have not had any issues with rotor run out yet.Also I have not gone to s/s calipers,still original ones on car. Later Geno
Last edited by 69elky; Sep 18, 2007 at 03:04 AM.
Thread Starter
Melting Slicks
Joined: May 2007
Posts: 3,246
Likes: 4
From: Bay Area CA
Sounds like a plan.
I would like to add GM allows up to .008 end play.End play over .001,.002 or .003 does not increase runout it only makes it almost impossible to accurately check.A new axle between centers that indicates 0 on both bearing surfaces and the rotor flange- will be 0 runout when install in the car with good bearings whether it has .001 end play or .008 end play.Once again with .001 end play you can check it and prove it....with .008 you can't. .......
I would like to add GM allows up to .008 end play.End play over .001,.002 or .003 does not increase runout it only makes it almost impossible to accurately check.A new axle between centers that indicates 0 on both bearing surfaces and the rotor flange- will be 0 runout when install in the car with good bearings whether it has .001 end play or .008 end play.Once again with .001 end play you can check it and prove it....with .008 you can't.
.......