A vehicle 10 is disclosed having a sliding door 12 fitted with a rotatable brake member 42 to apply a braking force to the sliding door 12 when the vehicle 10 is on a slope. The brake member 42 is automatically rotated about a pivot axis X-X by a moveable member 43C forming part of an actuator 43 when the vehicle 10 is resting on a slope into a position in which a braking force is applied to the sliding door 10 by the interaction of the brake member 42 with an elongate track in the form of a sliding door support track 20B.
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