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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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I believe the U.S. DOT started requiring dual braking systems in the early 1960s, I believe some Volvos, and other cars have three so that if you rip a break line off of one wheel the other three still work. The DB4GT Aston Martin had two single valve master cylinder connected by a bar as well.
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Hugh
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