Pressure Differential Warning Actuator
"The P.D.W.A. is an 'inline' hydraulic valve through which both brake fluid
lines are routed. The purpose of the device is to detect failure in either of
the systems and to transmit, electrically, warning of the failure to a light
on the faciab&."Triumph GT6/Vitesse 2 Litre Workshop Manual, p. 3.230.
Master Cylinder
"Application of pressure on the push rod moves the primary plunger up the
cylinder bore and allows a spring loaded tipping valve to return to centre.
The primary supply port is closed by the valve and further movement of the
primary plunger results in hydraulic pressure being transmitted to the wheel
cylinders of the front brakes. At the same time the pressure created acts in
conjunction with the increasing force of the intermediate spring to overcome
the stronger secondary spring, thus actuating the secondary plunger.
"Initial movement of the secondary plunger closes off the centre valve supply
port and the hydraulic pressure is transmitted to the wheel cylinders of the
rear brakes.
"In case of failure of either camber or circuit. mechanical contact takes
place within the cylinders and the remaining chamber builds up the normal
pressure to operate the brakes that it controls." same manual, p. 3.226.
--
Any questions? :-)
Obligatory nonconfrontational LBC/Triumph content: GA41429LDL, a white 1962
Herald 1200 sedan with red interior, is now a: mine and b: licensed for road
use. First legal drive (about 1.5 miles before darkness and rain set in on a
car that currently needs a column master lighting switch) was very promising.
I've actually got a running, driving Herald ON THE ROAD for the first time
in....well, never mind how long it's been. Just think pre-Watergate.... :-)
--Andy Mace
*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er,
B Triumph Herald engine with wings.
B B -- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
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