I'm pretty sure that there are 2 different 2 circuit
setups for the 122. My 122 is a late 67 model and it
has a dual circuit setup but one line goes to the front
brakes the other goes to the rear. Not good if you
lose the brakes on a twisty road and slam on the brakes
without knowing that only the rears work. Later they
went to the 4 pot front brakes where 2 circuits go to
each of the fronts and the rears are single but separate
circuits.
The early dual circuit system is probably good enough
for an emergency type situation. Heck, I've driven my
122 on just the E-brake before, but not far and I knew
ahead of time that I didn't have any real brakes.
chris
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