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Source Identified; Replace only the Brake Failure Light? 200 1988

posted by  Michael Yount on  Thu Jan 24 03:40 CST 2019
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last visit: Thu Oct 23 20:03 CST 2014
[RELATED]

Think I mentioned this much earlier in this epic thread. In order for the brake fluid level to drop in the reservoir, air has to be able to enter the reservoir. If you examine your reservoir cap carefully, you'll see there is a tiny vent hole -- mine is right in the center of the cap. If you top of the reservoir, screw on the cap and seal that hole with a piece of tape, you can disconnect a line(s) below and virtually no fluid at all will come out. It can't leave the system if air (atmospheric pressure) can't get in the top of the reservoir. Covering the vent hole prevents the air from getting in the top. Exactly like putting a straw into your iced tea, putting your thumb over the top and pulling out a straw-full of tea. When you remove your thumb, out comes the tea.

So taking this approach means you WILL NOT have to re-bleed your MC all over again when you replace/rebuild your brake failure switch.
--
82 242-6.2L; '17 Mazda3; '16 Crosstrek






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