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Old 03-20-2014, 05:52 PM   #9
RichardJ
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Join Date: Apr 2010
Location: So Cal
Posts: 1,490
Re: Who's master cylinder and booster?

This is what I see in your first picture. It is a pressure differential switch. A switch and nothing more. It is not a proportioning valve and it is not a brass combination valve that you are showing in your last post.
If you have a proportion valve, it may be somewhere in the line to the rear brakes.
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'67 GMC 2500, 292, 4spd, AC
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