[TR] TR6 brake problem

[Dave1massey at cs.com]

And if the O-ring did pass the opening that would create a path from the 
fluid circuits to the switch (which will not seal against the pressure -  or 
at all).

PDWA is an acronym for Pressure Differential Warning Actuator.  If it did 
more than just light the light the acronym would be different.

Great links.

Dave

In a message dated 5/27/2013 7:56:06 PM Central Daylight Time, 
fishplate at charter.net writes: 
> See http://www.vtr.org/maintain/pdwa.shtml - the piston is a constant 
> diameter.  How would it shut off flow, without some careful positioning 
> of the o-ring, which shouldn't easily seal a round hole in the side of 
> the bore anyway.