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I have a circuit tester for that, and have tested the sensitivity of the switch. Seems to take a reasonable pressure to activate, and is crisp in its on-off operation.
Rob, you mentioned the return port in the M/cylinder, and I was thinking along those lines: crud in the m/cylinder well, partially blocking a port. Looks like I'm at the stage of removing the m/cylinder, giving it a good clean and reassemble. What a pain! ![]() They are great when they are working fine, but ... Thanks again, Gents, for your very helpful comments. Mike Last edited by Mike Cecil; 09-03-21 at 17:20. |
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Yeah, for $40, how long do you want to spend figuring it all out. For about $60 you can replace both the master and the switch and be done with it.
One other point is what type of brake fluid are you using. I did note that some of the switches specifically mention they are not for use with silicone brake fluid. If the silicone causes the diaghragm within the switch to swell up and stick, that could also be your problem. |
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Rob,
Good points ... thanks. Mike |
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Then of course you could get rid of the pressure switch and for a few dollars and very little work put in a foolproof spring loaded switch on the brake pedal.
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That's true, Lang, but then, where's the challenge in that?? As my better half has often said: how hard can it be??
Tomorrow, it's m/cylinder change over time. The day after: that might be spring-loaded switch time!! Mike |
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Despite being as careful as I could in re-filling the master cylinder, I must have knocked a minute amount of crap from under the vehicle into the open m/cylinder.
Today, I changed over the master cylinder, bled the brakes and bingo! everything works fine. ![]() On flushing the removed m/cylinder with de-natured alchohol into a clean wash tray, I noticed some very small amounts of crap floating about. ![]() Lesson learned! ![]() Thanks for the help, Gents: all contributions to the discussion greatly appreciated. Mike |
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