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  #1  
Old 06-07-2019, 06:39 AM
Maxrate Maxrate is offline
 
Join Date: Dec 2008
Location: League city, TX
Posts: 598
Default 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...

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  #2  
Old 06-09-2019, 10:53 AM
WingsOnWheels WingsOnWheels is offline
 
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Location: Plano, TX
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Default

You could tear down the master and cut the threads a little deeper. Good opportunity to replace the seals while you are in there.
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  #3  
Old 06-09-2019, 11:16 AM
Mike S's Avatar
Mike S Mike S is offline
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Default 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.
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  #4  
Old 06-09-2019, 06:46 PM
Maxrate Maxrate is offline
 
Join Date: Dec 2008
Location: League city, TX
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Default

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
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N442MM reserved
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Last edited by Maxrate : 06-09-2019 at 07:05 PM.
  #5  
Old 06-09-2019, 07:25 PM
rightrudder rightrudder is offline
 
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Default

It looks like there's room for a thin jam nut on the reservoir's threads. I'd do the jam nut AND LocTite!
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  #6  
Old 06-09-2019, 07:58 PM
Maxrate Maxrate is offline
 
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LocTite and a jam nut. That settles it then! I?ll report ack in a few days. Thanks!
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Wings complete, SB 14 complied with, canopy and cowling in progress, Up on the gear.
N442MM reserved
http://www.mykitlog.com/MikeMike

2021 Donation gladly paid..
  #7  
Old 06-09-2019, 10:33 PM
BobTurner BobTurner is offline
 
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Location: Livermore, CA
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Quote:
Originally Posted by Maxrate View Post
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.
  #8  
Old 06-10-2019, 03:51 AM
sf3543 sf3543 is offline
 
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Location: San Antonio, TX
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Default

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.
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  #9  
Old 06-10-2019, 04:11 AM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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Default

Quote:
Originally Posted by Maxrate View Post
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!
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  #10  
Old 06-10-2019, 07:33 AM
Maxrate Maxrate is offline
 
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Location: League city, TX
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Default

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.

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N442MM reserved
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