POTENTIAL CAUSE(S)

CHECK THIS FIRST:

1. BURNED OUT LIGHT BULB; LIKELY IF ONLY ONE LIGHT DOES NOT WORK
Replace light bulb.

CHECK THIS NEXT:

2. BLOWN FUSE; LIKELY IF ALL LIGHTS DO NOT WORK
Replace fuse.

CHECK THIS LAST:

3. SHORTED OR MALADJUSTED BRAKE LIGHT SWITCH
Have brake light switch professionally adjusted or replaced.