System for measuring the braking force of a vehicle comprising: - a vehicle lift provided with a platform having a support plane on which, in use, said vehicle is arranged, said vehicle lift arranged to move from a lowered configuration, in which said support plane is arranged substantially at a same height of the floor of the room in which it is installed and operates in a brake test bench mode for measuring the braking force of said vehicle, and a raised configuration in which said support plane is arranged at a predetermined height from the floor of the room in which it is installed, in particular to carry out maintenance on the vehicle; - a measuring unit associated with said platform, said measuring unit configured to measure the vertical forces and/or the horizontal forces acting on said support plane when said vehicle lift operates in said brake test bench mode, said measuring unit comprising: - at least a first measuring device arranged on a first side of said platform; - at least a second measuring device arranged on a second side of said platform, said second side located opposite to said first side; said system being characterized in that a slide unit is furthermore provided configured to cause a mutual sliding of said first and of said second measuring device (61,62) along a first sliding direction when said vehicle lift moves from said lowered configuration to said raised configuration and a sliding in a second direction opposite to the first direction, when said vehicle lift moves from said raised configuration to said lowered configuration, in such a way that said first and said second measuring devices (61,62) are arranged to relatively move towards/away each other avoiding to be subjected to stresses. - a vehicle lift provided with a platform having a support plane on which, in use, said vehicle is arranged, said vehicle lift arranged to move from a lowered configuration, in which said support plane is arranged substantially at a same height of the floor of the room in which it is installed and operates in a brake test bench mode for measuring the braking force of said vehicle, and a raised configuration in which said support plane is arranged at a predetermined height from the floor of the room in which it is installed, in particular to carry out maintenance on the vehicle; - a measuring unit associated with said platform, said measuring unit configured to measure the vertical forces and/or the horizontal forces acting on said support plane when said vehicle lift operates in said brake test bench mode, said measuring unit comprising: - at least a first measuring device arranged on a first side of said platform; - at least a second measuring device arranged on a second side of said platform, said second side located opposite to said first side; said system being characterized in that a slide unit is furthermore provided configured to cause a mutual sliding of said first and of said second measuring device (61,62) along a first sliding direction when said vehicle lift moves from said lowered configuration to said raised configuration and a sliding in a second direction opposite to the first direction, when said vehicle lift moves from said raised configuration to said lowered configuration, in such a way that said first and said second measuring devices (61,62) are arranged to relatively move towards/away each other avoiding to be subjected to stresses. - at least a first measuring device arranged on a first side of said platform; - at least a second measuring device arranged on a second side of said platform, said second side located opposite to said first side;