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Old 09-27-2009, 10:13 AM
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Lets see who can answer this one!!!

I just took the brakes off the front of my 68 Camaro. They are disc brakes. The reason I took the off was because they seem to be sticking, and my wheels get so hot you can,t touch them. They seem to be in bad shape (the seal area. So i'm going to rebuild them. They are the 4 piston calipers. I would buy new ones, but they are like $200 a piece..ouch. The rebuild kit is like $60. Anyway the driver caliper has the number 545533 (delco moraine) when I tried researching it it seems like it shows small bore / what ever that is, and the passenger side has the number 5455946, which seems to show a large bore. I guess my question is I'm going to order the rebuild kit for them, but how does the different bore size effect anything or will it. I never seemed to have a problem before that I know of. I'm not ordering new pistons for them just going to clean them up really good. So I figured I would put this out to someone that may have allot of knowledge in this area.

Thanks

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Old 09-27-2009, 03:35 PM
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Quote:
Originally Posted by obengston
I just took the brakes off the front of my 68 Camaro. They are disc brakes. The reason I took the off was because they seem to be sticking, and my wheels get so hot you can,t touch them. They seem to be in bad shape (the seal area. So i'm going to rebuild them. They are the 4 piston calipers. I would buy new ones, but they are like $200 a piece..ouch. The rebuild kit is like $60. Anyway the driver caliper has the number 545533 (delco moraine) when I tried researching it it seems like it shows small bore / what ever that is, and the passenger side has the number 5455946, which seems to show a large bore. I guess my question is I'm going to order the rebuild kit for them, but how does the different bore size effect anything or will it. I never seemed to have a problem before that I know of. I'm not ordering new pistons for them just going to clean them up really good. So I figured I would put this out to someone that may have allot of knowledge in this area.

Thanks
News to me on the large bore/small bore - could one caliper have been replaced?

Before you buy the rebuild kit, disassemble the calipers and check the bores. The four piston calipers have one fundamental flaw, which is the piston seal is mounted on the piston and slides in the bore (like the piston rings in an engine). This creates a problem because any water in the brake fluid causes rust and pitting in the bores, which chews up the seals. Newer calipers put the seals in the bore and have them slide on a chrome plated piston. Even if the piston gets pitted, it's easy to replace. The only choices for pitted bores on your four piston calipers is replacement or stainless sleeves. Neither option is cheap.
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Old 09-27-2009, 06:01 PM
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If both calipers are getting really hot, key word both, as you say, perhaps the problem is the master cylinder sticking. and not in the calipers.
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Old 09-27-2009, 07:17 PM
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I took the one caliper apart and there is rust on the cylinder wall. I took some 1200 grit paper, and was able to smooth them out. Both calipers seals look pretty bad, but they were not leaking. I was thinking that the rust was preventing them from retracting all the way in, but not for-sure. Also as far as the master cylinder stickink and making them hot, how does that work, and is there a way I can tell if that is happening? It is a new master cylinder, but anything can go bad. I'm just not for-sure how a master cylinder sticks, or how to tell.
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Old 09-27-2009, 08:09 PM
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Looks like it's time for new calipers.

Vince
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Old 09-27-2009, 08:19 PM
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you mentioned new mastercyl, how long have you had it on ? is this when the problem appeared ? do you have vacume booster ? is it possible that it is incorrectly hooked up allowing the brakes to be partially applyed ?
just throwing some stuff out there see if it can point you in the right direction.
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Old 09-27-2009, 11:16 PM
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No offense to anyone who has responded, please, don't take this personal.
Hotrodders is the best hotrod site on the net. If you want "hotrod" info, this is the place. If you want Camaro information go to http://www.camaros.net/forums which is the best Camaro site hands down. What you have is 67-68 four piston disc brakes from what I remember the same as on the Vette. These are worth BIG bucks and yes the calipers cost big bucks. Don't change them, and for goodness sakes don't trade them in on rebuilds.

Go to the Team Camaro site and learn about them before you do anything.

I do know that they sell rebuilt stainless steel lined ones because those did have a problem with pitting in the bores.

But please, don't do a thing until you get more info from guys who really know those Camaros.

Brian
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Old 09-28-2009, 02:37 AM
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have you checked your rubber lines? they could be collapsing,ive had that problem before...i changed everything before i thought of the rubber lines and thats what it turned out to be
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Old 09-28-2009, 07:11 AM
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Originally Posted by old76c10
have you checked your rubber lines? they could be collapsing,ive had that problem before...i changed everything before i thought of the rubber lines and thats what it turned out to be
I know in the other thread he said they looked like the original lines.

I would go ahead and replace them. They can swell on the inside and act like a one way valve, letting fluid into the caliper and not out so much.

Not to mention it will be safer with new ones anyway..
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Old 09-29-2009, 09:37 PM
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many many things can be your problem, the rusted calipers, the sponged rubber lines, and mabe your master.
ive done alot of brake work on mismatched stuff on oddball cars.

put your car in neutral, hit the brakes and let off.
if you cant push the car, crack the line at the master, if it releases, the master is incorrect or bad. if it still holds the problem is with your calipers or rubber lines.
DO NOT MISMATCH BORESIZE WITH BORESIZE. the results are no bueno!
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