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Hi Ken,
Sorry, I missed your reply last week. Sounds like we are now discussing two distinct types of hose fault. In the foregoing discussion, the hose was weak, not restricted.
You said "Now, in contrast, with softer lines that allow some expansion, what would happen is that the pressure will also rise, but on a curve -- at first a lower slope than above as the expanding line increases its volume and therefore forcing the fluid into a larger space..."
But now you are correctly illustrating the pressure behind a restricted, or blocked hose. I like the electrical analogy. You're not wrong in my view. A blocked hose would not be the cause of a brake failure light, any more than a sticky piston (one that failed to retract with the others) would.
The real problem with the octopus is determining whether the switch contact is being made by a legitimately displaced shuttle or contamination from brake fluid, water, and rust. If it is the shuttle, was it a momentary failure, but the shuttle is stuck in rust and gooey o-rings? It is a two-fold analysis.
--
Art Benstein near Baltimore
A plateau is a high form of flattery.
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