The embattled chairman of the Civilian Complaint Review Board, whose law firm represents clients who sued the NYPD, severed ties Friday with a Queens man pursuing a federal excessive force case against cops.

Shortly before Richard Emery took over the CCRB, it substantiated an allegation against police made by Stefon Luckey. Later, Emery was criticized because his firm began representing Luckey in a federal lawsuit claiming he was beaten and pepper-sprayed by cops who racially profiled him outside a Queens deli in May 2013.

Police unions have called for him to be fired as chairman for the apparent conflict of interest. On Monday, the Sergeants Benevolent Association filed court papers seeking to disqualify his firm from representing Luckey.

On Friday in Brooklyn Federal Court, Emery Celli Brinckerhoff & Abady finally caved and withdrew. Lawyer Jonathan Moore, who also represents Eric Garner’s family, has taken over Luckey’s case.

Police unions, however, are still calling for him to be fired from the police watchdog agency.