A hydraulic handbrake is used on drifting and rally style cars as a seperate hand operated braking system for the rear wheels. This allows the driver to lock the rear wheels by instantly applying a tremendous amount of braking to the rear wheels alone, while the hand actuated method allows for precise control while over the limit.
Hydraulic handbrakes are a necessity for any track car that will be drifted or will need the rear brakes isolated for any reason. The stock hand brakes aren't nearly powerful enough to apply the force needed for ample stopping power due to their drum brake design, the brake cable tends to stretch and snap over time, and if the button accidentally catches, the hand brake may lock of the wheels longer than desired.
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