my hill decent light is playing the on and off game. computer is saying brake switch relay ??? anyone know where this is located or could it be something else

Don't think there is any relay in the brake light circuit, can't see anything on the circuit diagrams.

The brake light switch is also connected to the cruise control and engine ECU and clutch switch on TD5's, this is the normally closed contact of the switch, NOT the actual brake lights feed from the switch.

Peter