Hi Chris,
The PDWA valve also closes the system that has failed. The valve is basically
a shuttle valve. If one system (front or rear) were to fail the shuttle will
shift to close the failed system and maintain function in the other system.
The valve is shaped much like an H with the shuttle in the middle. If for
example, you have a line fail on the rear system, the pressure differential
from the front (normal pressure) to the rear (no pressure) will cause the
shuttle to shift to the low pressure side. What this all means is that you can
have a line failure (or cylinder) and still have brakes on either the front or
the rear.
I wouldn't bypass this valve, half of a braking system is much better than no
braking system.
Good Luck
Bill M.
'70 MkIII Spitfire
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