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Old 07-27-2011, 04:35 PM   #1
usmarine2009
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Front Brake Issues...

Anyone have know what would make the bleeder valve on the front master cylinder leak fluid. After a few days of sitting air has been getting in the MC and the valve seems to be tight enough to keep it from leaking..
Its leaking from around the threads if that helps any...
The only thing i can come up with would be that maybe thier could be a hair line crack under the screw...Any help would be great!
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Old 07-27-2011, 04:48 PM   #2
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Remove the bleeder and put a little teflon around the threads. Reinstall and see if it is still leaking.
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Old 07-27-2011, 05:59 PM   #3
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^^^^^^^^^^^^^^
But FIRST - get a small brass wire brush and brush out the threads. Try to clean out the threads on the casting the best you can also. The threads need to be clean and dry. When putting teflon on the threads - no more than 2 wraps (two thicknesses). DON'T wrap the thing up like a mummy.
Teflon is EXTREMLY slippery so when you feel it start to snug up don't go cranking the out of it afterward.
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Old 07-27-2011, 06:03 PM   #4
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Teflon sounds like it's not the best idea to me, but I suppose I would try it in a pinch.
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Old 07-27-2011, 06:24 PM   #5
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yea i was kinda leary about the teflon...but i'll give it a shot! if anyone has any other ideas let me know
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Old 07-27-2011, 06:49 PM   #6
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Why leery? It's used in high pressure hydraulics all the time in industry.
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Old 07-27-2011, 07:33 PM   #7
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It's your master cylinder failing. You are not getting air in from your bleeder, those Nissin radial master cylinders fail all the time. Feel free to google it, then give me a shout tomorrow at the shop, and we can discluss your options.
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Old 07-27-2011, 08:07 PM   #8
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NEVER USE TEFLON ON A BRAKE SYSTEM THAT USES GLYCOL BASED FLUID!
The brake fluid will dissolve the teflon. If it gets into your system it can cause a brake failure.

Pull the bleeder and see if there's any trash or scarring on the tapered point where it seats.
The threads themselves do not seal, the taper does.
Also inspect the taper to see if it's deformed from over torquing.
It is also possible the the cylinder itself is cracked/bad.
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Old 07-27-2011, 08:55 PM   #9
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Quote:
Originally Posted by Patrick View Post
NEVER USE TEFLON ON A BRAKE SYSTEM THAT USES GLYCOL BASED FLUID!
The brake fluid will dissolve the teflon. If it gets into your system it can cause a brake failure.

Pull the bleeder and see if there's any trash or scarring on the tapered point where it seats.
The threads themselves do not seal, the taper does.
Also inspect the taper to see if it's deformed from over torquing.
It is also possible the the cylinder itself is cracked/bad.
listen to this guy ^^^^ brake fluid is some nasty stuff
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Old 07-27-2011, 09:06 PM   #10
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Quote:
Originally Posted by signpimp View Post
Remove the bleeder and put a little teflon around the threads. Reinstall and see if it is still leaking.
Sorry, I should have put more info. I didn't mean to ride it like that. I was thinking he could just try and seal the threads to see if the leak was happening at the threads or leaking from the top of the bleeder hole. Bleeders are cheap to replace, calipers are not. Anyway, listen to Patrick!!
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Old 07-28-2011, 09:49 AM   #11
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Quote:
Originally Posted by Patrick View Post
NEVER USE TEFLON ON A BRAKE SYSTEM THAT USES GLYCOL BASED FLUID!
The brake fluid will dissolve the teflon. If it gets into your system it can cause a brake failure.

Pull the bleeder and see if there's any trash or scarring on the tapered point where it seats.
The threads themselves do not seal, the taper does.
Also inspect the taper to see if it's deformed from over torquing.
It is also possible the the cylinder itself is cracked/bad.
Thats what i figured it would do. I've visually inspected the tapered point and didnt notice anything wrong with it...but then again who knows what its doing when it gets a little pressure on it from the screw..

Thanks for the help!
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