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Drums brakes are only used in the rear of smaller cars. If the car is the size of a Toyota Corolla or smaller, then it is likely to have drum brakes. Disk brakes are actually more efficient and provide more braking power than drum brakes, so most cars opt for 4 disk brakes. Drum brakes are used on the smaller cars because the rear brakes don't work as hard as the front brakes in stopping the car. A manufacturer may opt for rear drum brakes to save weight and money on their vehicles.
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