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There are several reasons, the main one relates to the weight transfer that occurs when applying the brakes, making the front wheel brakes work harder, thus needing more effective stopping power and more efficient cooling.

It is basically a matter of cost. Drum brakes are cheaper to produce than disc brakes thus saving the manufacture money. Another reason is that on a vehicle without independent wheel suspension, as in a pick up truck, disc brakes are a little more difficult to design and produce. It all boils down to manufacturing costs. They will use drum brakes whenever they can.

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Q: Why do some vehicles have front disc brakes and rear drum brakes?
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