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10/4/11 1:00pm - Original Message: 'Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Well, the front control arms are all on and I'm ready to hook up all the steering components.  Or so I thought.  I was going to install the calipers tonight with new pads, but when I went to work on the passenger side, the caliper was "glistening".  Uh oh. Cry Pushing the pistons in and out caused fluid to seep out around the seals.   That one had been hanging kind of upside down off the frame for awhile, but I checked the driver side and same issue.  So I pulled one off and broke it apart.  Took out one piston and I'm pretty sure I've got the SS sleeves.  That's pretty good news, I guess?   I'm thinking I'm going to give the rebuild thing a shot.   Can I just pick up a parts house rebuild kit?  I checked Advance and they've got 'em.  Should be able to reuse the pistons? The one I took out looked to be in good shape.  

I am curious about the O-ring seal upgrade, though?  What does that entail? 

Here's a pic of that bore with what I think is the SS sleeve.  Was that an aftermarket upgrade for all C3's or did they eventually start doing it at the factory?  




(Large Image changed to link-Adams' Apple)

 





|UPDATED|10/4/2011 10:00:19 AM (AZT)|/UPDATED|


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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/4/11 4:31pm - Reply: 'Re: Leaking Calipers'
corvette440hp Lifetime Member
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Joined: 7/2/2006
Posts: 8205
Dave this tutorial might be of assistance to you:      

 

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

 

 

Larry



|UPDATED|10/4/2011 1:31:56 PM (AZT)|/UPDATED|


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corvette440hp
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10/2/11 11:17am - Reply: 'Re: Leaking Calipers'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
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That caliper has been sleeved. If the pistons are not corroded, and funky lookin, they can be re-used, and you can just get the rebuild kits anywhere. The O-ring seals take different pistons tho, I think...
The factory(GM) never sleeved the calipers...this is an aftermarket deal only.


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10/2/11 3:54pm - Reply: 'Re: Leaking Calipers'
yostusota
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
I use the rebuild kits from there too..cheap and easy..just clean them up good..getting the pistons back in with lip seals can be a little difficult..use a feeler gauge that has rounded ends to help install them..the seal on the outside..use a socket that fits the seal perfectly..usually only get one whack to get them in without damage..take your time and buy an extra set to use as a backup until you get the hang of it...I'm not into the o ring ones..as long as you keep the fluid clean they really are not needed. Rich

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My first parade at Carlisle 2010
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10/3/11 2:12am - Reply: 'Re: Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Thanks for the info, guys.  Rebuilding seems like the way to go.  I woke up this morning thinking I was going to bite the bullet and buy the O-ring kits, but they're a lot more expensive.  If folks have not had much trouble with the lip seal kits or if they did use them and wished they had converted, I'd be interested to know.  

I've read that rotor run-out is a concern, especially with the OEM lip seals.  Should I get the rotors turned before installing?  Seems like I've also read that turning rotors on our cars can cause more problems than it solves though?  I was not having any symptoms of warped rotors last time I drove the car.   (Just a bit of surface rust now since they've been sitting for awhile - figure that will come clean as soon as I drive it).  



____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/3/11 3:57am - Reply: 'Re: Leaking Calipers'
yostusota
Former Member
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
You're right about rotor run out..it can be a problem..the cure is a machine called the Pro cut..it machines the rotors on the car..so no worries about bubba doing it wrong off the car..I wouldn't bother with it any other way..if you just have some surface rust just sand paper it off.. Rich

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My first parade at Carlisle 2010
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10/4/11 3:01am - Reply: 'Re: Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Thanks, Rich.  That's pretty interesting about the machine that will turn 'em on the car.  The local O'Reilly's (used to be Shucks) will do them for $15 or 20 per rotor; they did fine with my truck's rotors, but not so sure about my Vette's (a little too Bubba-ish for my taste).  Think I'll just clean off the surface rust and put 'em back on the car and see what happens.  

Thanks for all the advice, guys!  


____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/4/11 9:01am - Reply: 'Re: Leaking Calipers'
corvette440hp Lifetime Member
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Posts: 8205
Dave, make sure to use a dial indicator to check the rotor run out. I always had a right rear rotor that made some noise. I had to add a couple of shims (in two places) behind to bring in the tolerence to the .005 limit. I finially bought a digital indicator, BIG NUMBERS.........easier on my old eyes to see.  

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corvette440hp
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10/4/11 4:19pm - Reply: 'Re: Leaking Calipers'
Gunslinger
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
While you're at it, go ahead and replace the rubber brake lines if you don't know if and when they've ever been replaced before.  Even if they look good, they have a habit of collapsing on the inside.  It's doesn't cost too much extra for knowing your brakes are in top notch condition.

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Poet...Mystic...Soldier of Fortune. As always...self-absorbed, adversarial, c o c k y and in general a malcontent.

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10/4/11 10:26pm - Reply: 'Re: Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
I most definitely will replace the brake hoses, in fact I cut one just to make it easy to get the caliper off.  They look a little sketchy (e.g. original) so I thought it was a no-brainer.  My question, though, concerns the rear trailing arm metal lines.  Seems like a lot of the catalog kits come with those.  Do they typically need to be replaced for some reason?  I haven't looked at anything on the back end for a while (rear wheels are still on) so I don't know their condition.  

Regarding checking the runout with a dial indicator -- I don't have any of those in my tool collection yet.  I may just go with the rotors as they are, but I may I might check 'em if I borrow or buy a set.  I've got time - I've already decided I have plenty of projects to keep me busy through the winter; this car ain't gettin' on the road till Spring.  


____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/4/11 10:42pm - Reply: 'Re: Leaking Calipers'
yostusota
Former Member
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
If you're talking about the small metal lines that hook right to the rear calipers..they get replaced because they don't like to come off easy..like to round off..if they come apart then they should be ok..but if you get them with the kit then they can be replaced..totally up to you and what happens! Rich

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My first parade at Carlisle 2010
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10/5/11 10:07am - Reply: 'Re: Leaking Calipers'
corvette440hp Lifetime Member
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Dave, you can visually see some imperfections by having the caliper mounted.....spin the rotor 360 degrees ..........while spining the rotor watch the clearance between the caliper and rotor. See if the rotor travels evenly between the pads. If it gets closer at times to one side or the other ..........the run out is off. On a different note the rear steel (or stainless) lines are available individualy. There is a right and a left. Also, I would replace the rubber lines with the better reinforced braided lines. another note: dial indicators are cheap..........Harbor Freight, but you also need a magnetic base or clamps to hold it's position. I'm not sure if Auto stores rent them out or not. Are we all helping or messing with your head?...........I hope we're helping.

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corvette440hp
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10/6/11 2:07am - Reply: 'Re: Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Oh, you're definitely helping, 440HP  Thumbs Up  All of you guys are.  This is such a great site for this kind of thing.  I do have to use judgement on some of the suggestions - if I followed all the great advice on this site I'd probably be broke by now.  Example: braided lines vs. rubber.  I totally agree the braided ones are better, but they're more than double the price.  So I'll most likely make a small sacrifice there and go with rubber (the ones on the car lasted this long).  But that's not to say I don't appreciate the suggestion - keep 'em coming!  

And I also concur on Harbor Freight.  There's one close to my office, I can actually walk there on lunch (often do) and browse around.  Usually I don't walk out of there empty handed.  I'm OK with the stuff they sell if it's a tool I'll use only occasionally.  Maybe I'll go check out their dial indicators one of these days.  

Thanks again, guys!


____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/6/11 6:38am - Reply: 'Re: Leaking Calipers'
yostusota
Former Member
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
Posts: 1518
The reason you would want braided over rubber is pedal feel..there is a difference there..the braided lines give you better pedal feel..as in you get faster response from the brakes..not so much on how long they would last..that's not really a big deal..they both have rubber inside that can come apart..a dial indicator from the HF would work fine...I haven't seen measurement tools made here in a long time..so why pay the big bucks for something like that anyhow..I got one that uses a vice grip to attach itself to whatever is being measured..works good on things that are not magnetic..it has a snake style arm that makes it very easy to get the indicator where you need it..no big deal though..get what they got there and it will work fine!! Rich

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My first parade at Carlisle 2010
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10/8/11 10:22am - Reply: 'Re: Leaking Calipers'
corvette440hp Lifetime Member
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Posts: 8205
daveo76 said: Oh, you're definitely helping, 440HP  Thumbs Up  All of you guys are.  This is such a great site for this kind of thing.  I do have to use judgement on some of the suggestions - if I followed all the great advice on this site I'd probably be broke by now.  Example: braided lines vs. rubber.  I totally agree the braided ones are better, but they're more than double the price.  So I'll most likely make a small sacrifice there and go with rubber (the ones on the car lasted this long).  But that's not to say I don't appreciate the suggestion - keep 'em coming!  

And I also concur on Harbor Freight.  There's one close to my office, I can actually walk there on lunch (often do) and browse around.  Usually I don't walk out of there empty handed.  I'm OK with the stuff they sell if it's a tool I'll use only occasionally.  Maybe I'll go check out their dial indicators one of these days.  

Thanks again, guys!
Dave HF has the dial indicator on sale this month (October) for $9.99. The magnetic base $11.99. You can use a 20% off coupon if you have them. I'm just trying to help you lighten your wallet a little...................
LOL

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corvette440hp
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10/8/11 12:05pm - Reply: 'Re: Leaking Calipers'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 830
Thanks, guys!  I think I'll go pick up the dial indicator and magnetic base from HF!  Should work out pretty well....good tip.

____________________________________

 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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10/8/11 2:48pm - Reply: 'Re: Leaking Calipers'
corvette440hp Lifetime Member
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Posts: 8205
daveo76 said: Thanks, guys!  I think I'll go pick up the dial indicator and magnetic base from HF!  Should work out pretty well....good tip.

Dave, Multipositional Magnetic Base with Fine Adjustment Part #623 (($9.99 on sale). 1" Travel Machinist's Dial Indicator Part #623 ($11.99 on sale). A real easy to use one that is more expensive is 1" Sae/Metric Digital Indicator Part #93295 (27.99 on sale). Remember to take 20% off coupons and ring them out separately.  If you've never used a dial indicator......ebo will fly out to help you.............LOL..................(man, I hope my buddy eboHeart forgives me for using his name in vain!)

|UPDATED|10/8/2011 11:48:55 AM (AZT)|/UPDATED|


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