The rear passenger's side brake doesn't work
The description given is rather vague. I'm not sure to what extent or in what way your right rear brake doesn't work. However, a brake problem that is exclusive to one wheel is usually caused by a faulty brake caliper. Calipers often seize up, locking the brake and wheel. I suggest having a professional mechanic inspect your rear brakes and come up with a diagnosis for a repair.
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