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whd721
Joined: 01 Oct 2007
Posts: 15
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 Posted: Sun Jan 04, 2015 2:15 pm Post subject: Latest Parking brake victim |
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I am in the final throes of finishing my RV. I have discovered the dreaded Matco parking brake leak. Can any one point me to the most probable leak source on the valve itself?
I have already added del seals and thread sealant to my fittings per previous posts. Now it appears the leak is in the valve itself.
I am dreading the trip back there, my ribs are still sore from the first attempt.
I am tempted to fabricate a tiny drip bucket.
| Quote: | On Dec 16, 2014, at 9:20 AM, Bill Watson <mauledriver(at)nc.rr.com (mauledriver(at)nc.rr.com)> wrote:
On 12/14/2014 10:20 PM, David Saylor wrote:
| Quote: | I've pretty much given up on teflon paste-type thread sealants. I prefer Permatex Aviation Form-A-Gasket on threads these days.
--Dave
|
I've used no sealant as well as several teflon past-type sealeants as well and had both brake line and oil line leaks. I've had leaks. The Form-a-Gasket sounds like a solution - wish I found out sooner. While chasing the equivalent Loctite product, I finally found and used this - Permatex High Performance Thread Sealant #56521. This too is a solution. They have a half dozen similar products but this works reliably and easily on high pressure tapered fittings. Little is required, it doesn't harden, it seems to cure instantly and simply doesn't leak. It works so well in comparison to the other products, I'm not sure how it does it but does. On a non-aviation note: I recently had the need to fix several water line breaks (black poly pipe). The landscape guys fixed it with gray PVC push in fittings and a white PVC cap on a tapered fitting. They all leaked very slowly. They thought it was the push in barb fitting and kept putting extra and new hose clamps on it but I could see it was the white threaded cap on the gray threaded fitting. The cap would inevitably break before one could tighten it enough to stop the leak. One light application of #56521 and no leaks - didn't even have to cinch it down very far. And the fittings were easily removeable with no dried up sealant pieces to get clean up and keep out of sensitive systems. I've done about 6 of these now - same results. I found the same with a slow leaking oil cooler fitting on the '10. | Quote: |
class="">www.aeroelectric.com
href="http://www.buildersbooks.com/" class="">www.buildersbooks.com
class="">www.homebuilthelp.com
class="">www.mypilotstore.com
class="">www.mrrace.com
class="">http://www.matronics.com/contribution
class="">http://www.matronics.com/Navigator?RV10-List
class="">http://forums.matronics.com
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_________________
whd721
RV9A
Beaverton, OR |
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sun Jan 04, 2015 6:11 pm Post subject: Latest Parking brake victim |
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You might give it a little time. I'm sure the years between production and introduction of brake fluid into he valve don't do the O-rings any good. I went for Permatex high performance thread seal, which I think is a little better than your average teflon paste. I got lucky, and the sealant on the pipe threads and DEL seals on the flare fittings stopped my leakage.
On Sun, Jan 4, 2015 at 3:12 PM, William DeLacey <whd721(at)msn.com (whd721(at)msn.com)> wrote:
[quote]I am in the final throes of finishing my RV. I have discovered the dreaded Matco parking brake leak. Can any one point me to the most probable leak source on the valve itself?
I have already added del seals and thread sealant to my fittings per previous posts. Now it appears the leak is in the valve itself.
I am dreading the trip back there, my ribs are still sore from the first attempt.
I am tempted to fabricate a tiny drip bucket.
| Quote: | On Dec 16, 2014, at 9:20 AM, Bill Watson <mauledriver(at)nc.rr.com (mauledriver(at)nc.rr.com)> wrote:
On 12/14/2014 10:20 PM, David Saylor wrote:
| Quote: | I've pretty much given up on teflon paste-type thread sealants. I prefer Permatex Aviation Form-A-Gasket on threads these days.
--Dave
|
I've used no sealant as well as several teflon past-type sealeants as well and had both brake line and oil line leaks. I've had leaks. The Form-a-Gasket sounds like a solution - wish I found out sooner.
While chasing the equivalent Loctite product, I finally found and used this - Permatex High Performance Thread Sealant #56521. This too is a solution.
They have a half dozen similar products but this works reliably and easily on high pressure tapered fittings. Little is required, it doesn't harden, it seems to cure instantly and simply doesn't leak. It works so well in comparison to the other products, I'm not sure how it does it but does.
On a non-aviation note: I recently had the need to fix several water line breaks (black poly pipe). The landscape guys fixed it with gray PVC push in fittings and a white PVC cap on a tapered fitting. They all leaked very slowly. They thought it was the push in barb fitting and kept putting extra and new hose clamps on it but I could see it was the white threaded cap on the gray threaded fitting. The cap would inevitably break before one could tighten it enough to stop the leak.
One light application of #56521 and no leaks - didn't even have to cinch it down very far. And the fittings were easily removeable with no dried up sealant pieces to get clean up and keep out of sensitive systems. I've done about 6 of these now - same results. I found the same with a slow leaking oil cooler fitting on the '10.
_blank">www.aeroelectric.com
.com" target="_blank">www.buildersbooks.com
="_blank">www.homebuilthelp.com
="_blank">www.mypilotstore.com
ank">www.mrrace.com
_blank">http://www.matronics.com/contribution
get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
|
[b]
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD |
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