The brother of a Manhattan bartender dragged to his death by a rush-hour subway train in Queens last month filed notice on Wednesday that he plans to sue the MTA for $20 million.

The agency was negligent when it allowed Edward Leonard, 51, to get stuck in the doors of a Manhattan-bound F train at the Kew Gardens-Union Turnpike station on Feb. 15, said Christopher Leonard’s attorney, Frank Andrea.

“The MTA and New York City Transit didn’t follow procedure to make sure all passengers were free of the door and not stuck in the door,” said Andrea. “Our investigation shows that they failed and were negligent to make sure all the doors were clear.”

Edward Leonard trying to board the train at 6:45 p.m. when he was dragged along the platform as the train pulled out of the station.

“He had multiple traumas as he was hitting fixtures going down the platform as he was stuck in the door,” said Andrea.

Police said the incident was not captured on surveillance footage, despite there being several cameras on the platform.

The MTA declined to comment Wednesday.