Quote:
Originally Posted by kyle_blake
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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I have driven the car with it bypassed. Its arguable whether it makes a huge difference. What I can say is that in the past the valve has proven to be dangerous if not in good condition.
I still prefer to two person bleed the car but I do it very slowly and take time after each bleed cycle to lift the pedal slow, allow the system to fill, do a few slow pumps, then do another bleed cycle.