A clutch pedal (1) for a vehicle, in particular, a motor vehicle, includes at least one side plate (2a, 2b) mounted for rotation spindle (3) connectable to the bulkhead of the vehicle. A peg (5) is fixed to one end of a pedal web (4) and slides in a first slot (21) provided in the side plate. A movement mechanism (7) causes the peg to slide in the slot, defining a length (L) between the rotation spindle of the side plate and the other end of the pedal web. A stud (8) is mounted in the side plate (2a) at a distance (R) from the rotation spindle, for receiving the end of the rod of the clutch mechanism of the vehicle. The clutch pedal operates to provide a constant step-down ratio (L/R).