hi

the brake servo/accumalator has stopped working i bought a new unit but it turns out there is no power going to the pump, iv traced the relay to drivers side footwell there power to the relay but there doesent seem be an earth on the switching side, when i connect this to ground the pump runs pemanantly, does any1 have a diagram for the brake wiring diagram? or does anybody know where this relay is switched from??

any help will be much appreciated thanks.