Wheelchair comprising: - a chassis, a seating part mounted on the chassis and front wheels and rear wheels which are mounted on the chassis, these wheels (12, 13) each having a tyre and together defining a rolling plane, - at least one brake equipped with a brake shoe and with a finger forming a cam follower, this brake being associated with a rear wheel and translationally moveable with respect to the chassis between a rolling position in which the shoe is away from the tyre of the wheel and a braking position in which the brake shoe is pressed against the tyre, - a mechanism for operating the brake, which comprises: o a cam collaborating with the finger, this cam being mounted with the ability to rotate with respect to the chassis between a rolling position in which, via the finger, the cam allows the brake to occupy its rolling position, and a braking position in which, via the finger, the cam places the brake in its braking position, o a return spring which urges the brake towards its rolling position; - a footrest mounted on the chassis, able to move with respect to the latter between a down position in which the footrest extends in the vicinity of the rolling plane and an up position separated from the down position, - a mechanism for actuating the footrest, which comprises a lifting arm connected to the footrest and mounted articulated with respect to the chassis, and a link rod which, at a front end, bears a cam follower bearing against the lifting arm; - an operating lever mounted to rotate with respect to the chassis, this lever rotating as one with the cam and being coupled to the link rod via a rear end of the latter, this lever being able to move between: ∘ a braking position in which the lever places the cam in the braking position and in which the lever allows the footrest to occupy its down position, ∘ a rolling position in which the lever places the cam in the rolling position and in which, via the link rod, the lever places the footrest in its up position, the footrest being independent of the seating part and its operation not being connected with the seating part, actuation of the footrest not being dependent on the seating part, the cam being provided with a stop notch in which, in the rolling position, the finger of the brake is housed. - a chassis, a seating part mounted on the chassis and front wheels and rear wheels which are mounted on the chassis, these wheels (12, 13) each having a tyre and together defining a rolling plane, - at least one brake equipped with a brake shoe and with a finger forming a cam follower, this brake being associated with a rear wheel and translationally moveable with respect to the chassis between a rolling position in which the shoe is away from the tyre of the wheel and a braking position in which the brake shoe is pressed against the tyre, - a mechanism for operating the brake, which comprises: o a cam collaborating with the finger, this cam being mounted with the ability to rotate with respect to the chassis between a rolling position in which, via the finger, the cam allows the brake to occupy its rolling position, and a braking position in which, via the finger, the cam places the brake in its braking position, o a return spring which urges the brake towards its rolling position; o a cam collaborating with the finger, this cam being mounted with the ability to rotate with respect to the chassis between a rolling position in which, via the finger, the cam allows the brake to occupy its rolling position, and a braking position in which, via the finger, the cam places the brake in its braking position, o a return spring which urges the brake towards its rolling position; - a footrest mounted on the chassis, able to move with respect to the latter between a down position in which the footrest extends in the vicinity of the rolling plane and an up position separated from the down position, - a mechanism for actuating the footrest, which comprises a lifting arm connected to the footrest and mounted articulated with respect to the chassis, and a link rod which, at a front end, bears a cam follower bearing against the lifting arm; - an operating lever mounted to rotate with respect to the chassis, this lever rotating as one with the cam and being coupled to the link rod via a rear end of the latter, this lever being able to move between: ∘ a braking position in which the lever places the cam in the braking position and in which the lever allows the footrest to occupy its down position, ∘ a rolling position in which the lever places the cam in the rolling position and in which, via the link rod, the lever places the footrest in its up position, ∘ a braking position in which the lever places the cam in the braking position and in which the lever allows the footrest to occupy its down position, ∘ a rolling position in which the lever places the cam in the rolling position and in which, via the link rod, the lever places the footrest in its up position,