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10-26-2014 06:38 PM #1
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Anybody know what this is?
It came off the master cylinder (the one on the bottom). I imagine it's either a proportioning valve of some sort or a pressure gauge. And why would there be a pressure gauge there?
Here is the other side. It's mostly illegible, but it looks like there are numbers. Looks like a pressure gauge.
Last edited by gearhead65; 10-26-2014 at 06:47 PM.
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10-26-2014 06:44 PM #2
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The top one's a brake light switch, which is just a pressure switch to actuate the lights. The bottom indeed looks like a bourdon tube for a pressure indicator. Not sure why....Last edited by rspears; 10-26-2014 at 06:46 PM.
Roger
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10-26-2014 06:54 PM #3
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The bottom one is a beat-up, almost demolished bourdon-tube pressure gauge with case broken off.Jack
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10-26-2014 07:32 PM #4
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FYI, if you mess with the bourdon tube it can break easily and you lose your brake fluid.Roger
Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.
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10-26-2014 08:47 PM #5
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Seems to me it would be worthwhile to take that old gauge out and insert a pipe plug to avoid what Roger said.Jack
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10-27-2014 04:31 AM #6
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That is one hella cool pressure guage, I bet it helped a lot of mechanics diagnose brake issues. It's kind of self evident why it didn't catch on. Dangerous if it fails..
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10-27-2014 01:28 PM #7
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So ugly it's kinda cute, huh? I had one under the driver side frame rail in my '56 GMC and since the brakes worked fine I never touched it.
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You're welcome Mike, glad it worked out for you. Roger, it's taken a few years but my inventory of excess parts has shrunk a fair bit from 1 1/2 garage stalls to about an eight by eight space. ...
1968 Plymouth Valiant 1st Gen HEMI