Abstract: An automatic-transmission wheeled motor vehicle having a wheel service brake applied by a brake pedal and an engine speed control operated by an accelerator pedal, the pedals being pivotally mounted side-by-side as to be operable by the vehicle operator's feet, is provided with a service brake anti-creep (original equipment or retrofit) device extending from the vehicle fire wall toward the pedals, the device including a stationary member having a slot and a spring latch with a rear lock edge and a front cam edge normally resiliently positioned in the slot, the brake pedal having a member extending toward the device and adapted, on final braking travel of the brake pedal, to cam the latch out of the slot and enter the slot to a position behind the lock edge so that the latch can re-enter the slot and retain the brake pedal member therein in the brake-on position, the device having structure adapted, upon initial operation thereof for increasing engine speed from idle, to pivot the latch away from the slot and