The masters were sleeved. The calipers were rebuilt. I never introduced brake fluid because I didn't know when I would be getting them roadworthy again. The MK II didn't even have the front caliper installed. I installed the parts the night before, and got one bled in the morning. The MK II front brake was bled out on the deck.
The green one is a 1973. My younger brother bought it at HPI from George Gjonovitch. It has always a peppy Norton. It currently has an HPI #3 cam, and lots of compression, with twin 34 Mikunis. The rear disc and mags were on it at the time of purchase, around 1977 or 1978. The black one has twin 32 Mikunis, but I have 34s to install. The rear master cylinder needs a rebuild, and I'm not sure what it is. I do believe that it is a handlebar mount front brake caliper with a remote reservoir, but I don't know the source. It appears that a front brake lever was machined to accept the foot pedal brake cable. It had the '68 primary cover when purchased.
HPI was a Norton shop first in Orange, then Garden Grove, then he worked a bit out of his house after an illness he never quite got over. He was a great guy. He was building 940 Commandos, was a Drouin Supercharger dealer, and also made his own NOX kits in the mid 70s. He built some Japanese engines too, mostly for some form of midget racing, but the occasional dragster.
There is a thread here about his V4 with two Commando top ends.