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-   -   Hardware help (Brake Master Cylinder Reservoir) (https://vansairforce.net/community/showthread.php?t=172188)

Maxrate 06-07-2019 06:39 AM

Hardware help (Brake Master Cylinder Reservoir)
 
So I'm helping a friend on his condition inspection and his brake MC reservoir has come loose over time. Were looking for a fitting that will allow the reservoir to be tightened with the MC and stay aligned. The original builder just TIG welded the thing on. Both are 3/8 pipe thread. I searched the spruce catalog and couldn't find a good option. Just trying to help a friend...


WingsOnWheels 06-09-2019 10:53 AM

You could tear down the master and cut the threads a little deeper. Good opportunity to replace the seals while you are in there.

Mike S 06-09-2019 11:16 AM

Possible fix.
 
Take it apart, clean and reassemble with green locktite???

The green stuff will stop a weeping rivet in a fuel tank, hopefully will work with brake fluid.

Maxrate 06-09-2019 06:46 PM

Thanks Mike. That’s a thought. The problem is the placement of the rudder pedal in the cockpit. If someone gets in and bumps the MC it is prone to rotate. Really a poor design. I did find this fitting. But think it may rotate too. I could also disassemble, clean and reassemble the MC and reservoir with red locktite 262 permanent. It will be slightly loose when assembled until the locktite sets up. Any ideas appreciated.

https://thornwellwarehouse.com/produ...78-dash-140466

rightrudder 06-09-2019 07:25 PM

It looks like there's room for a thin jam nut on the reservoir's threads. I'd do the jam nut AND LocTite!

Maxrate 06-09-2019 07:58 PM

LocTite and a jam nut. That settles it then! I?ll report ack in a few days. Thanks!

BobTurner 06-09-2019 10:33 PM

Quote:

Originally Posted by Maxrate (Post 1351876)
It will be slightly loose when assembled until the locktite sets up. Any ideas appreciated.

https://thornwellwarehouse.com/produ...78-dash-140466

Sealants are for tiny gaps between the threads. You need to find a way to get the threads tight before anything else.

sf3543 06-10-2019 03:51 AM

Teflon tape on the threads will likely fix this issue.
Even though some say Teflon tape should not be used, there is no rule against its use. Just make sure the tape is only on the threads and not blocking the hole.

Taltruda 06-10-2019 04:11 AM

Quote:

Originally Posted by Maxrate (Post 1351397)
So I'm helping a friend on his condition inspection and his brake MC reservoir has come loose over time. Were looking for a fitting that will allow the reservoir to be tightened with the MC and stay aligned. The original builder just TIG welded the thing on. Both are 3/8 pipe thread. I searched the spruce catalog and couldn't find a good option. Just trying to help a friend...


You said 3/8, but I think it's more like 1/8 pipe thread. No need for a jam nut on pipe thread, just a sealant like Teflon paste and retighten it up!

Maxrate 06-10-2019 07:33 AM

1/8? correct Tom. My problem is the geometry. Here is a pic. When the reservoir is tight it?s almost at a 90* angle. I?ve tried wrapping Teflon tape but if you bump it it moves. This ones got me stumped. I like the idea of locktite and a jamnut but am concerned about the seal. :confused:



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