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Baby Stinson 10A Looking for master cylinder parts

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Daniel Blystone
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Hello Again looking for some additional info.  Same baby Stinson now I'm

looking for those several parts of the master cylinder.  Working on the

master cylinder missing one of the inside metal section and rubber

plunger part.  Any idea where I can get those several parts.  (Forward side of the

master cylinder.)  Thanks

This topic was modified 1 year ago by Daniel Blystone

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Michael Samson
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It's not good news. They used automotive master cylinder parts back then. You used to be able to buy automotive ovhl kits but they have pretty much stopped selling them. If you find someplace that still sells kits you will need to go thru many to find the correct parts for your cylinders.

 Another option would be brake master cylinders from a  low wing Piper or similar


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Daniel Blystone
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@ecos36gmail-com

thanks for your quick advice 


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Dennis Crenshaw
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@dblystone  My Dad had told me that the master cylinders were from a '39 Dodge.  The system used automotive brake fluid instead of mil-spec 5606 hydraulic fluid.  The old Hayes master cylinders and wheels and brakes were a constant source of aggravation.  The expander tubes on the wheels had long since lost their elasticity and the brake blocks would constantly drag. The master cylinder bores were pitted so I frequently would get a soft pedal(our ownership was a long time ago--1953 - 1973).  I would install a Cleveland master cylinder with Cleveland wheels/brakes.  Others have done it with 337's.  


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Daniel Blystone
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Great Info,  we are blessed to have the old timers still around.  Both of my parents are gone.

I miss them alot.  I am blessed to work and do something that I wanted to do since childhood.

Work on planes.  Were all important in this world to make it complete.  Thanks again

80 year old Stinson.  


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Daniel Blystone
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Hello again I need some basic info.  Please help?

Hydraulic brake fluid called for the Stinson 108s is AV-VV-O-366b from the Service Manual and 

Hydraulic brake fluid called for the Stinson 10A is M-339a Oil  , what are the equivalents today?

Thanks very much


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resto108
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366 became 5606. 339 may have been the vegetable oil? Doesn't really matter, make sure your seals and hoses are compatible with 5606 and use it.


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Dennis Crenshaw
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@dblystone My Dad had told me (this was in the 1960's) that the master cylinders on our 10A were from a 39 Dodge truck, and we always used automotive brake fluid.  I wouldn't necessarily take that info to the bank for your airplane.  Are your master cylinders original?  Are you able to get replacement seals for them?  Our cylinders were corroded and were a constant headache.  Have you considered adapting more readily available aircraft master cylinders?  Also, do you still have the original Hayes wheels and brakes?  I would definitely change those out and some Clevelands in their place.


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Dennis Crenshaw
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Whoops.  I see I gave you the exact same answer a couple of months ago.  


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Michael Samson
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Adapting modern master cylinders to a model 10 would be a trick.  The Cleveland unit from a low wing Piper would be the one to use, but I think you would need to do some welding to mount it. Maybe a fabricated bracket that would bolt to the old mounting..


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Daniel Blystone
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Thanks again, all this info was very helpful, have a good day, Dan B. 


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Michael Samson
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 I've studied the situation and decided that it won't be a big deal to mount modern master cylinders. So, I bought a pair from a PA-28-235 for a $100 on EBAY. I should have done this at first.


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Dennis Crenshaw
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@ecos36gmail-com  Michael, are the PA-28 master cylinders the kind with a remote reservoir?  I saw a picture quite a few years back of a 10A with those type cylinders located under the floor like the original installation, with a remote reservoir mounted elsewhere, presumably on the firewall.


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Michael Samson
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 Yes. The old Firestone brake system has a reservoir on the firewall too. The new cylinders will not just bolt on, but will need a bracket for the cylinder end support. The pushrod should not be a problem. There will be some plumbing changes but pretty straight fwd. 


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Michael Samson
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I had some 4130 steel

IMG 20201121 151755

that was right for the job. The 2 ears are where the old master cylinder was mounted 


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