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Fresh C3 brake problems

naz235

Member
Joined
Apr 23, 2010
Messages
9
Location
Pennsylvania
Corvette
1975 Dark Red L82
So I've gone and made myself some new problems

I found my front calipers to be leaking, and suspecting the obvious, opted to remove and inspect the inside of the caliper piston bores. Sure enough, there was a decent amount of fluid dripping from the piston seals. The calipers had been sleeved and were in fairly good shape, so I opted to rebuild them. Removal and disassembly went well, and 3 of the 4 pistons went in smoothly. #4 was a problem child and ended up getting stuck in a bore because I cocked it in sideways a bit and then actually broke the damn thing trying to wiggle it back out. $2 part and $8 in shipping later, i put it all together and go to bleed it.


A few brake pumps later and I hear a nasty pop, and an even more disturbing dripping sound. I brake cleaned the caliper down and found it seemed to be dripping from the seam in the caliper housing. Is it possible that the fresh new o-ring blew, or is it more likely that I blew one of the fresh new lip seals?
 

Antz81

Well-known member
Joined
Dec 21, 2013
Messages
936
Location
Auckland, New Zealand
Corvette
1981 4 speed
So I've gone and made myself some new problems

I found my front calipers to be leaking, and suspecting the obvious, opted to remove and inspect the inside of the caliper piston bores. Sure enough, there was a decent amount of fluid dripping from the piston seals. The calipers had been sleeved and were in fairly good shape, so I opted to rebuild them. Removal and disassembly went well, and 3 of the 4 pistons went in smoothly. #4 was a problem child and ended up getting stuck in a bore because I cocked it in sideways a bit and then actually broke the damn thing trying to wiggle it back out. $2 part and $8 in shipping later, i put it all together and go to bleed it.


A few brake pumps later and I hear a nasty pop, and an even more disturbing dripping sound. I brake cleaned the caliper down and found it seemed to be dripping from the seam in the caliper housing. Is it possible that the fresh new o-ring blew, or is it more likely that I blew one of the fresh new lip seals?

I would guess its one of the lip seals. The o-rings are fairly reliable. Although in saying that I've also had leaks past the sleave as well, but these tend to be a very small leak
 

bill81vette

Moderator
Joined
Jan 17, 2004
Messages
4,316
Location
Troy,NY
Corvette
1981 dark blue metallic
the lip seals are notorious for leaking..When I did my '81 i did a little
research on the brakes and found this out.I was going to rebuild mine with o-ring but opted to
purchase remans,as there has been rust in a couple of them.never had a problem wit them in 10 years!
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
If the leak is coming from the part line between the caliper halves and the caliper bolts were tightened properly, my guess is you blew out one of those little o-rings.
 

naz235

Member
Joined
Apr 23, 2010
Messages
9
Location
Pennsylvania
Corvette
1975 Dark Red L82
I found the problem, and it was just as I suspected. Air had blown out one of the lip seals and split it cleanly, the caliper housing o-rings were intact.

Luckily, RockAuto had sent me a defective kit so I ended up with a few spare lip seals after I received the other wheel's kit.

So thats one of the 50 leaks taken care of
 

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