[Twinz]

So i bought a new double din tv for my car. I used to have a single din pioneer dvd player installed and had the parking break wire grounded so that i could get video display without the parking brake. Im installing this alpine and trying to do the same but it has 2 wires, 1 for parking brake and one for foot brake lead. The instruction say after wiring them you need to:
1 bring car to complete stop and engage parking brake
2 keel pushing foot brake and release parking brake one then engage it again
3 when parking brake is engaged for second time release foot brake

Ive tried grounding both but didnt work. Does anyone know of a way to wire it so that it will work with the parking brake down?

Thanks