A pneumatic valve unit for use in a tire changer for selectively connecting at least one pressure source of the tire changer to at least two operating members (TT, CJ, BBA, BBB) of the tire changer upon successive operation of at least one pedal of the tire changer, the pneumatic valve unit comprising: - a pneumatic valve comprising: ∘ a valve housing defining a valve chamber, the valve housing having at least one inlet for fluidly connecting the valve chamber to the pressure source, and at least one outlet (32A, 32B) for fluidly connecting the valve chamber to the operating members (TT, CJ, BBA, BBB), and ∘ a plunger axially slidably received in the valve housing, the plunger being operatively coupleable to the pedal and movable between at least two predetermined axial positions (P0, P1, P2) upon successive operation of the pedal so as to selectively connect the operating members (TT, CJ, BBA, BBB) to the pressure source, and - a selection mechanism for selectively connecting the pressure source to the operating members (TT, CJ, BBA, BBB) upon successive operation of the pedal, wherein the selection mechanism comprises: - a selector housing for axially slidably receiving the plunger therein, - a cam body comprising a plurality of cam surfaces (146A, 146B), - a spacer body comprising a plurality of spacer surfaces (164A-C, 166A-166C, 168, 170) for coacting with the cam surfaces (146A, 146B), and - a biasing means for biasing the spacer body towards the cam body, wherein, when the pedal is released, the selection mechanism is adapted to axially and rotationally restrain the plunger in one of the predetermined axial positions (P0, P1, P2) and the spacer body in one of at least two predetermined rotative positions relative to the plunger, and, when the pedal is operated, the selection mechanism is adapted to release the rotational restraint of the spacer body and subsequently allow the spacer surfaces (164A-C, 166A-166C, 168, 170) of the spacer body to coact with the cam surfaces (146A, 146B) of the cam body so as to cause the spacer body to unidirectionally rotate to another one of the predetermined rotative positions such that, upon release of the pedal, the plunger moves to another one of the predetermined axial positions (P0, P1, P2), wherein the plunger, upon successive operation of the pedal, is successively movable between at least three predetermined axial positions (P0, P1, P2) such that the pneumatic valve has at least two working positions, wherein in each working position one of the operating members (TT, CJ, BBA, BBB) is fluidly connected to the pressure source, and at least one resting position, in which the operation members (TT, CJ, BBA, BBB) are fluidly disconnected from the pressure source. - a pneumatic valve comprising: ∘ a valve housing defining a valve chamber, the valve housing having at least one inlet for fluidly connecting the valve chamber to the pressure source, and at least one outlet (32A, 32B) for fluidly connecting the valve chamber to the operating members (TT, CJ, BBA, BBB), and ∘ a plunger axially slidably received in the valve housing, the plunger being operatively coupleable to the pedal and movable between at least two predetermined axial positions (P0, P1, P2) upon successive operation of the pedal so as to selectively connect the operating members (TT, CJ, BBA, BBB) to the pressure source, and ∘ a valve housing defining a valve chamber, the valve housing having at least one inlet for fluidly connecting the valve chamber to the pressure source, and at least one outlet (32A, 32B) for fluidly connecting the valve chamber to the operating members (TT, CJ, BBA, BBB), and ∘ a plunger axially slidably received in the valve housing, the plunger being operatively coupleable to the pedal and movable between at least two predetermined axial positions (P0, P1, P2) upon successive operation of the pedal so as to selectively connect the operating members (TT, CJ, BBA, BBB) to the pressure source, and - a selection mechanism for selectively connecting the pressure source to the operating members (TT, CJ, BBA, BBB) upon successive operation of the pedal, - a selector housing for axially slidably receiving the plunger therein, - a cam body comprising a plurality of cam surfaces (146A, 146B), - a spacer body comprising a plurality of spacer surfaces (164A-C, 166A-166C, 168, 170) for coacting with the cam surfaces (146A, 146B), and - a biasing means for biasing the spacer body towards the cam body,