NASCAR racer Connor Zilisch was forced to pump the brakes on celebrating his big Xfinity Series win in New York Saturday when he tumbled from his car and broke his collarbone.
The horrific ordeal was caught on video -- Connor was climbing onto the roof of his No. 88 Chevrolet racecar to celebrate his W when his left foot seemingly got stuck in his window ... making him take a hard fall to the ground.
Paramedics quickly arrived to render aid .