Message text written by "Jim Altman"
>I hate to disagree, but I don't think there is a seal at the switch. If
the
>seals on the shuttle leak then fluid(f) will come out the switch, even if
>the switch is good. If the seals leak the shuttle may not move due to the
>divergent pressure. I think the shuttle area is intended to be dry.
This is true. There are two sealed chambers with a dry section in between.
>I had the same problem and elected to solve it by replacing the switch
with
>a bolt. I think on prior trips down this thread we concluded that the
brake
>warning light will provide several hundred microseconds warning that your
>brakes have a failure before you impact that which caused you to try and
>brake in the first place.
Jim and list, the PDWA is of no use if you suffer a catastrophic failure as
you described HOWEVER if you get a leak in a wheel cylinder the slow
reduction in fluid pressure in the rear circuit (which may not be noticed
by the driver) will cause the shuttle to move off center iluminating the
light warning the driver to have the brakes serviced.
>If you replace the seals be sure and use the type that is brake fluid(f)
>resistant or you'll be right back doing it again.
As you say there are seals that are good against brake fluid. And there
are members of this list who know what that material is. I am not one of
them and I am hoping that those who do know will fill in this blank.
Of course, if you are using DOT5 you can use anything so take your seals
(O-rings) to the hardware store and fine suitable replacements.
Dave Massey
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