Hydraulic handbrake as the only handbrake is not a safe option, they simply aren't designed to permanently retain pressure. In NZ for example you can get your (race) car legal for road use only if you also carry wheel chocks in the vehicle or have a backup cable system. Ask yourself this, if you left it parked on a hill are you confident it would be there when you got back? What if it was parked there for a week?
Callum
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