sprinter 208 wiring problem

[leeflude23]

hi all I have a wiring problem ,the (!) brake warning light flickers on and off ,have traced all the wiring back and found that there are three live wires from diferant componants which put that light on ,one is the resevoir low level warning I know that much i have ruled this out by separating the wires and connecting them one by one it doesn't put the light on but one of the other two do does anyone know what they are ?or does any one have a wiring diagrame for the 208 2.3d p reg 1996 thankyou, regards lee.