To start with I have this but the adaptors are incorrect. They are for a standard flair fitting. I need the German style / double bubble ? What's it called ???

Second I'm using a Wilwood pedal box W/2 brake master cylinders and the brakes are Boxster front part number 996351426. There's some shots below, I don't know what size bore masters to use. Anyone have any thoughts ?

Fitting size is 10 mm metric bubble flare. 914 standard master size is 17mm. 911 is 19mm.
Not sure 19 is even enough to operate the boxster calipers.

I hope you're not planning to run stock 914 rears... Front/rear calipers should be upsized together, but that's another drawn out thread. That being said I did a later 930 upgrade to my early 930, swapped the 19mm with a Mercedes 23 mm unit, you might want to start there. You should really talk to these guys:

http://www.vehiclecraft.com/Brakes/930_upgrade.htm

The whole point of dual master cylinders is so you do not have to run a proportioning valve. One M/C feeds the rear, the other feeds the front. You change the linkage between the pedal and the M/Cs to change the brake bias. No prop valve (or pressure limiting valve) needed.

--DD

Shoot
I've got a lot to learn LOL
I'll check out these guys.


http://www.vehiclecraft.com/Brakes/930_upgrade.htm

Wow, nice setup! But more than I paid for both 914's

I'm not running any stock parts on this car !!!! LOL I believe the brakes to be 996 / Boxster "S". OH, I'm running a stock TARGA top !