new dual master cylinder leaking at the lid - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**AngryPirate** · 05-07-2012, 11:38 AM

I've tried making sure the rubber gasket thingy is seated properly and the clips are obviously snapped on but it still leaks fluid out of the lid/casting seam.

Ideas how to get this sealed up? It's a friggin' new MC and I really don't want to send it back and re-bleed the brakes.

Thanks,
Scott

66GTO66C10 · 05-07-2012, 12:37 PM

It may sound elementry, but I found the spring clip that holds the cap on sometimes too lose. If you put a little more of a bend in it that some times resolves the issue.
Good luck.

**AngryPirate** · 05-07-2012, 03:18 PM

Quote:

Originally Posted by 66GTO66C10

It may sound elementry, but I found the spring clip that holds the cap on sometimes too lose. If you put a little more of a bend in it that some times resolves the issue.
Good luck.

I'll give it a shot.

Thanks.

dar130 · 05-08-2012, 09:26 PM

I had the same thing with my Master cylinder.
I installed disc brakes on the front, with a new MC. It turns out the parts store sold me, by mistake, the wrong MC.
Check the parts number and be sure it is the correct one.
I had one that was for disc brakes on all 4 corners.

**AngryPirate** · 05-08-2012, 09:31 PM

Quote:

Originally Posted by dar130

I had the same thing with my Master cylinder.
I installed disc brakes on the front, with a new MC. It turns out the parts store sold me, by mistake, the wrong MC.
Check the parts number and be sure it is the correct one.
I had one that was for disc brakes on all 4 corners.

I picked it up from classictruck.com but it also doesn't call out drum or disc brakes (as you suggested looking up). Classictruck.com just specifies it will work for my year.

http://www.classictruck.com/product/...ster_Cylinders

I'll dig into your suggestion a bit more.

Thanks!

Gianyveedub · 05-08-2012, 10:04 PM

I had the same issue, I replace the rubber gasket thing and it solved the problem.

**AngryPirate** · 05-08-2012, 10:15 PM

Quote:

Originally Posted by Gianyveedub

I had the same issue, I replace the rubber gasket thing and it solved the problem.

How'd ya know which gasket to get?

Was the replacement thicker? The gasket should be new, but perhaps it sucks? ;-)

**AngryPirate** · 05-17-2012, 11:24 PM

So I tried bending the master cylinder clip ends a little higher up to shorten the clips to create a tighter closure on the lid and it did stopped the leaking.

Just an fyi for others who are having the same issue. I'm sure a bit thicker gasket would've accomplished the same thing.

Thanks for the responses.

05-07-2012, 11:38 AM	#1
AngryPirate Senior Member Join Date: Jan 2012 Location: Austin, TX Posts: 561	new dual master cylinder leaking at the lid I've tried making sure the rubber gasket thingy is seated properly and the clips are obviously snapped on but it still leaks fluid out of the lid/casting seam. Ideas how to get this sealed up? It's a friggin' new MC and I really don't want to send it back and re-bleed the brakes. Thanks, Scott

05-07-2012, 12:37 PM	#2
66GTO66C10 Registered User Join Date: Jul 2010 Location: Rio Rancho, NM Posts: 79	Re: new dual master cylinder leaking at the lid It may sound elementry, but I found the spring clip that holds the cap on sometimes too lose. If you put a little more of a bend in it that some times resolves the issue. Good luck. __________________ ---------------------------------------------- 1966 Chevy C10 frame off resto (In progress) 1966 GTO Numbers matching original 1989 Toyota Pickup (Tonka) resto 2002 HD FLSTC 2000 HD FLSTC 1996 Ninja ZX11 Believe nothing of what you hear, and 1/2 of what you see!

05-08-2012, 09:26 PM	#4
dar130 Registered User Join Date: May 2012 Location: Vancouver, WA Posts: 10	Re: new dual master cylinder leaking at the lid I had the same thing with my Master cylinder. I installed disc brakes on the front, with a new MC. It turns out the parts store sold me, by mistake, the wrong MC. Check the parts number and be sure it is the correct one. I had one that was for disc brakes on all 4 corners.

05-08-2012, 10:04 PM	#6
Gianyveedub Registered User Join Date: Mar 2011 Location: Hollister, Ca Posts: 178	Re: new dual master cylinder leaking at the lid I had the same issue, I replace the rubber gasket thing and it solved the problem.

05-17-2012, 11:24 PM	#8
AngryPirate Senior Member Join Date: Jan 2012 Location: Austin, TX Posts: 561	Re: new dual master cylinder leaking at the lid So I tried bending the master cylinder clip ends a little higher up to shorten the clips to create a tighter closure on the lid and it did stopped the leaking. Just an fyi for others who are having the same issue. I'm sure a bit thicker gasket would've accomplished the same thing. Thanks for the responses.



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