Chances are you have a 240/260/280Z MC installed; with it, the overall
balance front to rear will be about correct, *IF* you still have the stock
13/16" bore rear wheel cylinders....if they were changed to later 3/4" wheel
cylinders, then but you'd have an awfully hard pedal, and might not be able
to lock the rear wheels and the nose will dive a lot under hard braking -
The stock dual-circuit MC on '67.5-'70 roadsters is 3/4" bore, but that does
not necessarily mean that the other one you have is a 'proper' roadster
unit, as Nissan used the Tokico brand for most of their cars, and many used
3/4" size......one significant difference between the roadster 3/4" MC and,
say a 510 3/4" MC is the thread pitch of the line fittings (of this I'm only
99% sure, so please confirm this elsewhere).
I'd first check the size of your rear wheel cylinders - if they are 13/16,
then consider just buying a new/reman 240-280Z (but not 280ZX!) MC, as
opposed to guessing what model of 7/8" you have.
If you have 3/4" rear wheel cylinders, I'd try installing the 3/4" MC you've
got - if the brake lines will thread *properly*, chances are good that it is
OK....but be VERY careful, as metric and imperial male and female fittings
can be forced together, but will leak and/or fail at the worst possible
time - when you need brakes!!
As for sway bars - my car has/had/will have again a 7/8" front bar, and I
plan on retrofitting a stock 5/8"(?) front bar on the rear.
----- Original Message -----
Sent: December 7, 2002 6:05 PM
Subject: master cylinders, etc
> Questions for the list:
> My '65 has been modified at the firewall to fit a dual brake master
> It has a "7/8" marking on it. What model is this from? I need to buy
> rebuild parts and I don't know for what. In my spares box I've got a dual
> master cylinder, very similiar in design, with a few small differences,
> as the front brakeline pickup point. It has a "3/4" marking on it. What
> model is this from? Interchangeable?
> What is the diameter of front (and rear, if any) swaybars listers are
> Thanks, Troy
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