Leave out the PWDA. Its extra plumbing and was only there because some lawyer said there had to be some indication that there was a brake failure. Unfortunately, it only actuates AFTER you step on the brake pedal and by that time you foot should have told you there is a problem.
I just recently converted my IIa from the single circuit to a dual circuit system - but I went with the servo-equipped master. And its a new pedal tower with a bigger hole in the bulkhead plus modifying the wing to accomodate the servo..
And more fun, I'm in the USA, its a RHD truck. I had some fun finding another servo-equipped RHD truck to make a pattern for the modifications.
I had looked at options for a non-servo dual master - I may have been able to find one if I had a part number...
Cheers
Mike
