A pedal control assembly 10 for moving an operating member 22 of a system 10, includes an actuating part 14 which is pivoted to a pedal support structure 12, and a linkage mechanism 20 between the actuating part 14 and the operating member 22, the linkage mechanism 20 including a pivot member 28 which is pivotal about a second pivot axis B generally parallel to a first pivot axis A about which the actuating part 14 pivots, the pivot member 28 including first and second formations 29, 30 which extend radially outwardly of the second pivot axis B, the first formation 29 being pivotally connected to the operating member 22 and the second formation 30 being pivotally connected to a link 35 which extends to and is pivotally connected to a lever member 18 which extends radially outwardly of the first pivot axis A about which the actuating part 14 pivots, and moves with the actuating member 14, whereby upon an initial actuating part 14 movement from a rest condition, the operating member 22 is moved a greater amount than for a corresponding subsequent actuating part 14 movement.
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