RE: Brake Problem
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RE: Brake Problem - 11/15/2007 3:15:06 PM
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DeeVeeEight
Posts: 471
Joined: 10/24/2007
From: South Jersey
Status: online
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Hi Texas Jim,
In response to your response about not buying the air thing...
Our C3 Corvettes have fixed calipers, not floating calipers. With a floating caliper rotor runout is absorbed by the ability of the caliper to move with the distorted rotor. With a fixed caliper rotor runout can cause the caliper piston to follow the uneven surface, thus the pulsating pedal effect and possibly the air in the system. It is a theory of last resort, I do agree.
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If you don't ask, you get the same answer as no.
1979 L-82, 383 Stroker, Edelbrock RPM Air Gap intake, Holley 750, Headers, Flowmasters, VB&P 400# rear monospring, Richmond 5 speed. American Racing Vector Wheels, Firestone Indy 500's
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RE: Brake Problem - 11/15/2007 4:17:43 PM
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dar322
Posts: 72
Joined: 8/15/2007
Status: offline
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I had to stop by the vette shop to pick up a part that they ordered for me and we got to talking about the brake light. He says its only a matter of time before the brake light comes back on and says they would check runout for the fronts. Well, there was no air in the fronts, only the rears. If the light does come on again, does it sound right to replace the rear calipers only or do all 4?
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RE: Brake Problem - 11/15/2007 5:26:47 PM
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DeeVeeEight
Posts: 471
Joined: 10/24/2007
From: South Jersey
Status: online
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I subscribe to the theory that if it ain't broke - don't fix it. If your front brake calipers are not at fault, why replace them?
_____________________________
If you don't ask, you get the same answer as no.
1979 L-82, 383 Stroker, Edelbrock RPM Air Gap intake, Holley 750, Headers, Flowmasters, VB&P 400# rear monospring, Richmond 5 speed. American Racing Vector Wheels, Firestone Indy 500's
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RE: Brake Problem - 11/15/2007 6:14:58 PM
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C3 Starship
Posts: 4686
Joined: 7/25/2006
Status: offline
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I agree, unless you're doin' an upgrade.
I've already admitted that I'm no whiz on disc brakes, but it seems to me that if you can do something to improve quality, performance, and reliability, then do it. 
( otherwise, I'd still be drivin' a Chevette.  I just dropped the "H", changed the "E" to an "O", and the "V" to an "R". Made a world of difference.  )
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1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response.
400+ hp, 454, M-22, 3.07
http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg
2007 H. D. Sportster, XL 883 EFI
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RE: Brake Problem - 11/15/2007 6:45:14 PM
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73shark
Posts: 1055
Joined: 4/18/2006
Status: online
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If the runout on the rears is in spec, then re-bleed the brakes.
If not,  then replace rear rotors and make sure they meet runout spec. You can check in all five locations for the best runout.
If you can't meet it, then you can get the tapered shims if they're still available.
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So many toys, so little time
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RE: Brake Problem - 11/15/2007 8:32:25 PM
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pg
Posts: 998
Joined: 8/7/2006
Status: offline
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How much run-out on the rotor is acceptable?
If the rotor is "true" but when mounted on the hub it is out of spec, how do you correct that?
How much end play is acceptable for the front bearings?
How much end play is acceptable for the rear bearings?
dar322, I hope this second bleed solves your problem.
Texas Jim, still not convinced that "air" is a problem with our vettes,
call "Corvettes Etc" at 704 394 5150 he has repaied only vettes for the last 20 years, mabye he can convince you. PG.
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my Vettes birthday, May 1, 1974
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RE: Brake Problem - 11/16/2007 7:48:16 PM
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73shark
Posts: 1055
Joined: 4/18/2006
Status: online
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quote:
ORIGINAL: pg
How much run-out on the rotor is acceptable?
Lateral runout TIR (65-70) .002", (71-later) .005" However total allowable end-play plus run-out should not exceed .009" on rear wheels.
If the rotor is "true" but when mounted on the hub it is out of spec, how do you correct that?
First try indexing to the other four positions. (This may require re-drilling the parking brake access hole on the rear rotors) If that doesn't work then you can either get tapered shims that fit on the bolt circle or have someone turn the rotors with them mounted on the car.
How much end play is acceptable for the front bearings?
Service manual states .001-.008" It also provides the correct procedure to achieve this.
How much end play is acceptable for the rear bearings?
Same as front. Adjustment is difficult and requires special tools. There are aftermarket companies that will rebuild your trailing arms.
dar322, I hope this second bleed solves your problem.
Texas Jim, still not convinced that "air" is a problem with our vettes,
call "Corvettes Etc" at 704 394 5150 he has repaied only vettes for the last 20 years, mabye he can convince you. PG.
_____________________________
So many toys, so little time
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