The disturbing footage records severely autistic Faruk Ali, 33, screaming for his mother as PCs Christopher Thomas and Christopher Pitts tackle him outside his house.
The officers, who said Faruk had aroused their suspicions by wearing flip-flops in the street, were cleared of racially aggravated assault and misconduct after a trial in 2014.
But on Thursday a panel found them both guilty of gross misconduct and they were sacked. Video of the incident in Luton, Beds, on Feb 20, 2014, was released by police.
In the 5.33 minute video the pair can be heard laughing as they drive past Faruk, who was watching the weekly bin collection outside his house.