[TR] TR6 brake problem

[Randall]

PDWA = Pressure Differential Warning Actuator.  What it does is actuate the
warning (big red light on dash) when there is a pressure differential.  It's
not a valve at all, does not control flow at all.  The seals are only to
keep fluid from leaking out through the switch.

Take a look at http://goo.gl/fYlAz
You can see how both ends are turned down, so fluid can flow freely past
even when the piston is against the side of the housing.

-- Randall