[Fot] More brake line questions

[Bill Babcock]

I suggest you search the archives of FOT, this was all discussed at  
length. It's a little challenging to get the master cylinder adapters  
to make 37 degree work, but they are out there. I can't testify to the  
thread on Girlings since I don't use them, but I doubt it's pipe  
thread. Generally brake parts have a flare at the end of the hole and  
matching one in the union that threads into it.

Most of the stuff I used came from aircraft spruce. As I recall, you  
can use 37 degree flares with a 45 degree male adapter as long as you  
use the tube sleeve to keep the flare stable. 37 degrees is the AN  
standard. As I recall, the flare nuts are AN 818 and the sleeves are  
AN 819. I think the AN832 bulkhead unions (steel, not aluminum) are  
what I used for my Tilton master cylinders.

The reason for using 37 degree bits is that the flare seals by  
stretching rather than by being compressed (and hardened). The tube  
sleeve applies pressure evenly on the flare and makes it seal better  
than 45 degree SAE bits.

There's also an article on the dimebank garage: http://www.dimebank.com/tech/BrakePlumbing.html

On May 26, 2008, at 8:33 PM, Mark York wrote:

> Amici
>
> More TR3 brake questions: do the Girling master brake and clutch  
> cylinders
> use BSP pipe thread? What standard does the 37 deg aircraft hardware  
> follow
> (is it AN)? Is there an adapter available to use the 37 deg b-nuts  
> on the
> master cylinders?
>
> Thanks in advance
>
> Mark
> _______________________________________________
> http://www.team.net/donate.html
>
> Fot mailing list
> Fot at autox.team.net
> http://autox.team.net/mailman/listinfo/fot
>
> You are subscribed as billb at bnj.com

Bill Babcock
Babcock & Jenkins
Billb at bnj.com
503.936.7660
www.bnj.com