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Jeep 9 Inch Drum Brake

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Early 4x4s usually came with small and inefficient brakes, as illustrated by this 9-inch-diameter drum on an early Jeep. Later 11-inch drums provide greater surface area and stopping power, especially when combined with different-size wheel cylinders. If you've ever had to hold the brake pedal to the floor on the side of a hill to keep from rolling over, you know how important low pedal pressure and quality brakes can be.