Oakland police say Jonathan Bandabaila disappeared May 3.
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His family says he was driving to a soccer tournament at the time, and he had plans to attend a formal dance.
His 1998 Honda Accord was found parked on the San Mateo bridge.
RELATED: Police seek clues in Bay Area teen's disappearance
Bandabaila's brother says the search has taken a heavy toll on both he and his family.
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"And they don't see me cry much. Yet every time I come forth to speak about this situation I try so hard to stand still, stand tall, stand strong, and I can't stay composed yet I do know that my brother's out there. And I do feel one hundred percent that he'll come home and we'll find him," said Harrison Bandabaila
Police are asking anyone with information on Jonathan Bandabaila to call a special 24-hour hotline at 510-238-3641.