In the olden days when cars were first being built, the accelerator pedal was often a long pedal connected to the floor by a hinge type arrangement and acted like a lever. It was long to give you a lot of control over the throttle in the carb.
The brake pedal was often a lever suspended from above and acted more like a plunger to operate the master cylinder for the brakes. (Possibly as a lever to pull a cable in really early machines)
Most likely they are still designed this way as a throw back to those earlier designs.
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