Park brake not working

Me again, since I got my 2010 TDV8 Vogue facelift version, the parking brake light has been illuminated. The parking brake doesn't work. the seller told me the parking brake module is missing. The only reference I can see to the parking brake module is a complete unit that has cables going to each of the rear heels and it needs half the car to be removed to get to it. Personally I can't see that someone would remove it completely the replace all the bist without fitting another module. Is there another ECU somewhere that controls this, and if there is, is it connected to the MOST fibre circuit? If so that may explain why the info system and radio won't work

It might have been removed to try and fix it (the motor with the cables) it all comes out in one piece, if i recall