class j - >that would explain how gravity bleeding only lasted for a couple rides b4 losing my brakes. The theory is if you slam on the brakes that back drums will have the time necessary to come on so you are not slamming your front's on. A car stops with more control starting with the back's applying. hence the name hold off for front's.
i went crazy for months on end chasing my tail because of that valve. did the 70 gto have a combination valve and no hold off ?
i can't see the combination valve somehow having a built in metering for the hold off? Not sure how this all got handled as year progressed.
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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