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Hi. I make it on my rojo due local regulations (single brake circuit is forbiden by law on my country).
Need to use the right size of master cylinder (internal piston diameter).
Also, the rear drum circuit need a valve pressure limiter (or it will be lock with hard braking).
By now I'm using a brazilian Varga brand master cylinder (with a adapter) plus a non-regulable valve limiter, both available on my city (sure best and more economical or optimal parts will be available to you, on that, I suggest to follow Shayne lead).
Braking is now more easy and powerfull (but, it could be only my feeling due I've a servobrake attached to my front calipers).
Btw, Amazons uses originally a single circuit. Due US regulation, on 1967 or 1868 it change to a dual circuit (front / rear) and in the next year they redesign the system with a in-line serve (non remote as the previous servos) with dual circuit (two front calipers plus one rear drum on every circuit).
The latter is the way used on modern cars, due it I believe the change to dual circuit without updating with dual front calipers produce only a marginal advantage (but, of course, it help me to pass the annual tecnical control).
You can see a photo of my klutz on:
http://www.brickboard.com/GALLERY/images/3954.jpg
Happy volving,
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Joaquin (yogui the bear) / Rojo 121 / Lima, Peru
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