The PDWA is what MAKES it work... If there is a leak, the shuttle valve moves
in the direction of the leak to close off that channel. The second channel then
takes over all the braking chores. If it ain't there, just having a dual master
cylinder doesn't mean anything!
Kent
1960 Bugeye
1978 Midget
Need explanation about a brake failure using the late model dual master
cylinder without the PDWA. Shouldn't the dual system work without it??
Thanks, Bob
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