1970 - 1976 Mopar Combination Valve Autopsy
I found this 1973 A-body combination brake valve on eBay. I believe the original part number is 3549947. Original applications include 1973 through 1976 Plymouth Duster, Scamp, Valiant, Dodge Dart, and Demon with front disk and rear drum brakes. The same type of valve was used on other Mopar vehicles from January 1, 1970 - 1976. It's purpose is to detect differences in front-to-rear brake system fluid pressure and to control fluid pressure to the rear drum brakes.
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