The hyrovac does not control the rear axle 2 speed, if you have a vacume reservoir that would be the only thing in common. While I was rebuilding the brake system on my 5700 I bypassed the hydrovac, I am now using manual brakes with all six wheel cylinders and the master cylinder having rebuild kits and all new cupro-nickel lines and new rubber hoses. You have to adjust the shoes very close, mine stops very well with a solid pedal and no leaks. I doubt it will ever be loaded to 16000 lbs. so for now I'm happy with it.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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