Electric car e-brake.

["Robert Jaarsma" <jaars@emailmv.com>]

How about a hydraulic pressure tank with a solenoid. 
When you park you put the hydraulic pressure to the front calipers via a
solenoid. When you want to go, just release the pressure with another
solenoid. Easily electrically wired up. While driving a little pump
should bring the tank back to pressure. This would even work with rear
disk brakes.
Robert