Stuart Lawrence - whose brother Stephen was the victim of a racist attack in 1993 - says he was forced to complain to police after he was pulled over in November, near his home in Peckham.
The 35 year old teacher claims that when he asked officers why he'd been stopped, he was told they were "naturally suspicious" of him.
He sent a letter of complaint to the Metropolitan Police yesterday, naming officers he claims were involved in the latest incident. Mr Lawrence told the Daily Mail:
I am being targeted because of the colour of my skin, I don't think it's because I am Stephen's brother.
Whenever I have been stopped, I have never subsequently been charged with anything, and nothing has ever been found to be wrong with my car.
I have never, ever, done anything wrong. I have never been in trouble with the law. I have paid my road tax and my insurance, and always tried to keep my cars in a roadworthy state.
More top news
Three security staff at a Vauxhall nightclub have been cleared of manslaughter after a man they restrained passed out and later died
A family is homeless after a fire in their tumble dryer. The family had been in touch with the manufacturer after a recall notice went out.
The crew's union Unite said the airline was "joining the 21st century" following a two-year row over the issue.