It ain't the HydroVac if the fronts are releasing. I would pull the rear drums, find out if the wheel cylinders are relaxed and why the shoes are hanging up on the backing plate or are the springs installed wrong/ weak/ missing. Did you replace ALL of the brake lines AND rubber hoses? I haven't had a PTO but I believe it is a simple flange mount with no rocket science involved, remove the bolts and pull the PTO gear box off.
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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