Brake Light Wiring

[toakenspy]

Hi everyone. Here is my first post on this site.

 

I am trying to fit front and rear parking sensors on a 2010 Ford Galaxy and the wiring is like this.

 

RED - Ignition

BLUE - Brake light wire

BLACK - Earth

YELLOW - Reverse light wire

 

Can somebody tell me please what colour of wires I should connect these wires to as there's loads of coloured wires. I can't even get out the rear lights as when I remove the long plastic screw behind it, it still seems to be stuck at one of the corners, it's difficult to feel around in there.

 

Thanks.