1 The brake light switch 2 The fuse for the brake lights 3 The bulbs for the brake lights 4 The bulb contacts in the brake lights 5 The earth connections in the rear light clusters 6 Generally check for loose or broken wires in the vucinity of the brake light switch and the rear light clusters.
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Here are some things to check:-
1 The brake light switch
2 The fuse for the brake lights
3 The bulbs for the brake lights
4 The bulb contacts in the brake lights
5 The earth connections in the rear light clusters
6 Generally check for loose or broken wires in the vucinity of the brake light switch and the rear light clusters.