Tommy Florio, 42, and Danny Sandler, 32, were working at the 70th floor of the Metropolitan Tower at 145 W. 56th Street when one of the brakes failed on their scaffold, leaving it dangerously tilted, they told The Post.
The glaziers hit the emergency brake, leaving their platform dangling in the air.
Next, they tried to call for help -- but high above city streets, they found their cell phones could not get enough reception to call 911.
DARING SCAFFOLD RESCUE IN MIDTOWN
Jeffrey Velasquez, who was working on the 60th floor of a building a worker in a building across the street, saw the men's frantic signalling, and had a colleague dial 911.
Emergency services cops got the call around 11:30 a.m., and rushed to the scene.
Then, they pulled Florio and Sandler inside. Neither window washer was injured.
The two co-workers planned to take the rest of the day off -- they headed yesterday afternoon to the bar at a nearby Hooters restaurant.