The Bloomberg administration, in its most aggressive push yet to erase the stain of a judge’s rulings on police stop-and-frisk practices, asked a federal appeals court on Saturday to vacate her decisions, which had ordered sweeping changes including the appointment of a monitor.

The decisions by Judge Shira A. Scheindlin, of Federal District Court in Manhattan, had already been halted by the United States Court of Appeals for the Second Circuit while it considered the city’s appeal. But if Mayor-elect Bill de Blasio, as he has promised, withdraws the appeal, the court-ordered reforms would most likely go into effect.

The city’s filing, which came shortly after midnight, seemed aimed in part at ensuring that Judge Scheindlin’s rulings disappeared before Mr. Bloomberg leaves office, and did not detract from his legacy. But if the Second Circuit rules in favor of the city, there would be a more immediate ramification: Mr. de Blasio, a Democrat, could take office without a Police Department under court supervision.

Mr. de Blasio was asked on Friday night, while in San Juan, P.R., attending a conference of Hispanic lawmakers, about the attempt to vacate Judge Scheindlin’s order, which the city said last week it would seek to do.