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Old 12-24-2013, 02:43 PM   #1
cornerspeed92


 
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Why are my brakes leaking?..update.

Ok so the bleeder valve isn't loose.This happens after most track sessions.This has happened 3 times on the drivers side,and once on the passenger side.I went to the dealer,and my service manager seems to think that im getting my brakes so hot that the bleeder valve distorts just a hair,and the fluid comes out under immense pressure.Now i am brutal on my brakes,i brake late and hard,and i know my brakes are freaking hot.My dealer is one of the good ones,and he told me to set up my GoPro inside the wheel well,he wants to see how red my rotor is getting.He wants to send the video to GM and say what are we going to do about this.He even says the 1LE is marketed as "A TRACK READY CAR" so any informed brake guys know whats going on here?


Ok,so lots of great info on this issue. I talked to my dealer,and he talked with GM and sent them this picture,long story short. They ordered me new calipers,and GM wants these back,so they seem to be taking this seriously.
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Old 12-24-2013, 03:51 PM   #2
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Quote:
Originally Posted by 130R View Post
Not buying that theory. Brembo has been in the brake business forever with a huge racing history. I can confidently say you're not getting substantially more heat in your brakes than any other Camaro on a track day (unless you're running R-comps or slicks?).

Since the calipers have been powder coated, that's where I'd start.

Is that a picture of the actual leak? Is the other caliper that leaks a rear as well? Where does the fluid appear to be coming from (bleeder screws or the crossover tube)? Was there any powder coat in any of the threads?
These are the stock 1LE brakes,so i couldn't imagine there is any powder coating in there.No i am completely stock tires etc.except stainless lines and Motul 600.This pic is of the passanger side,this is the first time i saw this.The other 3 times have been on the drivers side.It is coming from the bottom of the bleeder screw where it screws in to the caliper.There is no leak from the rears.
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Old 12-24-2013, 04:01 PM   #3
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Replace the bleeders and tape the threads.
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Old 12-24-2013, 04:17 PM   #4
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They're all like this or at least all of mine were too. Coarse threads and poor tolerances. All he needs is thread tape. Done.
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Old 12-24-2013, 04:24 PM   #5
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What kind of tape? i couldn't imagine just regular Teflon tape with the kinda heat there.
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Old 12-24-2013, 04:25 PM   #6
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That's really strange. I'd inspect the threads and bleeder screws. The easiest thing to do is replace the bleeder screws and see if that does it.

You have to be careful not to over tighten the bleeders. I take it it doesn't feel like there's any cross threading at all?
The bleeder screws have never been out,so i couldn't have crossed threads,right?
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Old 12-24-2013, 04:30 PM   #7
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Thats all it takes. You can buy high temp thread sealant if you really want to.

Take them out 3 turns and then feel how much wobble is in the bolt. Spoiler alert: a lot. The tolerances stink.
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Old 12-24-2013, 04:31 PM   #8
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Originally Posted by cornerspeed92 View Post
The bleeder screws have never been out,so i couldn't have crossed threads,right?
The factory loves cross threading things but usually its the oil cooler. This is 99.999% a crap tolerance like all of them have due to coarse threads.
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Old 12-24-2013, 04:40 PM   #9
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And tape is 550 degree temp
http://www.amazon.com/LA-CO-Slic-Tit...thread+sealant

High temp thread sealant is only 400 degree...
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Old 12-24-2013, 04:41 PM   #10
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Thanks gentlemen.,will i need to re bleed them after?
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Old 12-24-2013, 04:46 PM   #11
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Yes. Backing it out enough to get tape on them will introduce air.

Buy a vacuum bleeder that hooks up to an air compressor if you don't already have one. Best money I ever spent.
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Old 12-24-2013, 04:58 PM   #12
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I never had an issue with any either on any other car ever. Every track day they leaked on this car. Tape=fixed. You're over complicating it.

A couple turns and they wobble a lot, more than any bolt should due to the thread size. Add heat to the caliper when they're tight and the tension seal is no longer there so they weep. Add tape and it stays sealed. Done.
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Old 12-24-2013, 07:07 PM   #13
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Are the insides of the rubber bleeder caps wet when you inspect them after this occurs?

It seems odd the leak would occur at the bleeder junction with the caliper and not at the rubber cap.
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Old 12-24-2013, 07:23 PM   #14
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Well, the threads don't make the seal, the taper at the end of the screw does. If the threads are damaged, you may not get a good seal at the taper.

Either way, I don't see anything unusual about the slop of the bleed screws considering the thread pitch. Brembo isn't some fly-by-night company; these brakes are well engineered and don't come with Teflon tape.

Personally I wouldn't want to risk introducing teflon tape into my brake system. First I'd replace the bleed screws. If that didn't work, I'd get the calipers warrantied. No band-aid fixes when it comes to the brakes for me...
There is a lot of good info here,but i would have to agree,with a warranty issue.I am going to do the GoPro the next track day,since thats what my service manager said.Im also going to get new bleeder screws,and see what happens.

Quote:
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Are the insides of the rubber bleeder caps wet when you inspect them after this occurs?
This i didn't do,so no idea.

It seems odd the leak would occur at the bleeder junction with the caliper and not at the rubber cap.
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