Likely the bulb is burned out. Do LEFT lights work? If so, replace both bulbs since it is due to go out too.
If only the right rear brake/signal light is effected it is not the fuse. Inspect the right rear brake/signal bulb, socket and wiring.
More than likely you have a burnt out bulb at the front signal light, rear signal light, or brake light on the right side.
change the light bulb,
At the right rear light the brake light wire is white. There is a manufacturer installed connector for a trailer lighting kit use located about 12 inches ahead of the left rear tail light behind the plastic panel holding the accessories options. The connector holds an orange wire for continuous power. It also has the white wire for brake lights. It has the dark green for right signal lights, yellow for left signal. At the right rear signal light assembly there is more than one dark green wire.
the turn signal switch is probably bad
the bulb with two elements in it is the turn signal and brake light bulb
Hmmm, kind of unusual because the same bulb filament serves BOTH the blinker and the brake function. It could be a short in the wire from the brake switch leading back to that particular bulb and if the left brake light work okay it would have to be somewhere AFTER the wires leading to the rear lights branch off from one another. Are you CERTAIN that the right rear signal blinker DOES work?
check the light bulb same double element bulb for both lights
Question: Does the turn signal blink on the right rear? I suspect not. Both the brake light and the turn signal use the same filament. If one is burnt out, the other will not work either. If so, the bulb needs replacing.
your brake light switch is probably out
you have a blown bulb, some vehicles use a double filiment bulb that operates the turn signal and brake light
Turn Signal Light Doesn't Work, but the Brake Light DoesMost vehicles use a single lamp [bulb] for the tail light, brake light, and turn signal functions.That lamp usually has two filaments: one serves both the tail light and brake light functions while the second filament serves the turn signal function.You description of the issue sounds like the turn signal filament is burned out, while the other filament is not.Another, but less probable cause could be that the conductor [wire] supplying electrical power to the right turn signal filament has either been cut, or corrosion has built up within one of the wiring harness connectors somewhere in that circuit. Corrosion acts to cut off the flow of electricity.