In Cars, Brush takes part in the final race of the Piston Cup season that year at the Motor Speedway of the South during the Dinoco 400. During the race in was one of the higher positions during it. After Chick Hicks causes a huge accident between the majority of the competitors, he collides with Kevin Racingtire. He later enters pits and comes out fine and is able to finish the race.
Between the events of Cars and Cars 3, Brush, along with McCoy stopped competing in the Piston Cup for Fiber Fuel and seemingly retired. Fiber Fuel wouldn't come back to the Piston Cup until it hired GoGo Logano as the new Fiber Fuel racer.
Brush Curber is a Sherpa Motors Lota GT, a model that is very similar to the Capitol Motors Verve XT, and the only other known one alongside Billy Oilchanger. He uses Lightyear racing tires. His eyes color is blue. Brush is painted in a yellow-orange color scheme with red and white stripes on his sides. On his hood the Fiber Fuel logo can be seen and the number 56 appears on his doors, roof, right sticker headlight and left sticker taillight. With his design wheats can be seen on him, representing fiber. Fiber Fuel's slogan "I'm Run'n Regular" appears on his bumper. Fiber Fuel's logo also appears on his backsides and trunk. He also has a two-piece grille, representing a mustache.
Brush Curber is considered to be one of the most consistent veteran Piston Cup contenders. Curber had numerous top ten finishes in the 2006 season, but a string of mid-season malfunctions severely side tracked his run for the Cup. With help from his Fiber Fuel sponsor and an overhauled diet, Brush purged his losing ways. He also attributes his resurgence to his loving wife of forty years, Katherine, and their fourteen children, Hal, Brush Jr., Penelope, Jake, Marty, Willard, Ingrid, Lucille, Scotty, Wendell, Aimee, Kassidy, Florence and of course Truman.