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