The department denied race was involved - though Mr Jacobs was supported by veteran firefighters who said it was an effort to get him and two other black recruits out. Mr Jacobs is still there; the other two left.
As part of the humiliation, he was given a toothbrush to scrub bathroom and kitchen floors. He was what one fire official termed "the highest-paid janitor in the city".
He was segregated from his fellow rookie firefighters, ordered not to speak to them or dine with them. He had to eat in his car. Fire officials rigged a hose test by tying knots in it and hiding vital pieces.
He was failed in the test four times. Only when the test was filmed by an observer from the Black Firefighters' Association did he pass.
Mr Jacobs blamed the fire chief for failing to stop the humiliation. The chief did intervene, but relief was only temporary.
Ironically, in a true, liberal San Francisco way, the city's fire chief is a woman - Joanne Hayes-White.
Dr King might have had a dream but Mr Jacobs clearly had a nightmare.