no brake lights

[young'er]

brake lights not working, yes have checked both bulbs. The odd thing is the brake lights work when head/side lights are on, any ideas please

[The Bobdogs]

Usual suspect is the pressure switch on the master cylinder, it's under the dash cover, on the underside of the cylinder, just unplug the spade terminals and link them together ....see if the lights come on...
However, with them working when the other lights are on sounds more like an earthing fault, check the connectors on the light clusters and go from there.....