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An automatic slack adjuster is the main component that keeps the brake shoes at the proper distance from the surface of the brake drums. As the brake shoes and the brake drums wear down, the automatic slack adjusters will automatically adjust the brake shoes so that the shoes remain at the proper distance from the drums. If the brake shoes lock up within the brake drums, the automatic slack adjusters must be manually adjusted to release the brakes.
Generally used in smaller engines for machines like lawnmowers and go-karts, centrifugal clutches use centrifugal force to engage the gears. They connect the drive shaft to the axle, which allows it to spin the wheels. Essentially, pads inside the clutch push outward on the hub as they spin, and the hub then pushes on the sprocket, which in turn spins the drive train and moves the machine.
Foundation brakes are components inside a truck wheel which encompass many smaller parts of the brake system.
