just pulled my 1974 trans am sd455 with 12,000 original miles (all original paint ) out of hibernation, had one rear wheel cylinder that was leaking so i honed and redid original wheel cylinders....have bled by vacuum and manual....brakes have no leaks and work good and not great...have ordered the tool to keep valve from engaging....factory service manual calls for the use of tool when both pressure and manually bleeding...so i am going to try tool next...thx keith
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