A method for detecting and measuring a clamping force and/or a braking torque deriving from the actuation of a friction braking system for vehicle, by means of detection performed in a brake pad of the braking system, wherein the method comprises the steps of: - encapsulating at least one fiber-optic strain sensor in a casing, and incorporating said casing in a respective portion of friction material adhering to a base plate or platform of said brake pad, said portion of friction material being sensitive to friction so that the tangential strain (St-eff) to which the casing is subject in a tangential reference direction (x) is representative of the tangential force (Ft) acting on the brake pad, and the normal force (Fn-eff) to which the casing is subject in a normal reference direction (y) is representative of the normal force (Fn) acting on the brake pad; - detecting, by said at least one fiber-optic strain sensor, a first strain, present in a first position of the casing along a predefined first spatial direction, said first strain being dependent both on the normal force (Fn-eff) and on the tangential strain (St-eff) acting on the casing; - detecting, by said at least one fiber-optic strain sensor, a second strain, present in a second position of the casing along a predefined second spatial direction, said second strain being dependent both on the normal force (Fn-eff) and on the tangential strain (St-eff) acting on the casing; - generating, by the fiber-optic strain sensor, a first photonic signal, representative of the first detected strain, and a second photonic signal, representative of the second detected strain; - receiving said first photonic signal and second photonic signal, by an optical reading/querying unit, optically connected to said fiber-optic strain sensor; - determining, by the optical reading/interrogation unit, the value of the first strain and the value of the second strain, on the basis of said first received photonic signal and second received photonic signal, respectively; - determining a measurement of the clamping force and/or of the braking torque based on the determined values of said first strain and second strain. - encapsulating at least one fiber-optic strain sensor in a casing, and incorporating said casing in a respective portion of friction material adhering to a base plate or platform of said brake pad, said portion of friction material being sensitive to friction so that the tangential strain (St-eff) to which the casing is subject in a tangential reference direction (x) is representative of the tangential force (Ft) acting on the brake pad, and the normal force (Fn-eff) to which the casing is subject in a normal reference direction (y) is representative of the normal force (Fn) acting on the brake pad; - detecting, by said at least one fiber-optic strain sensor, a first strain, present in a first position of the casing along a predefined first spatial direction, said first strain being dependent both on the normal force (Fn-eff) and on the tangential strain (St-eff) acting on the casing; - detecting, by said at least one fiber-optic strain sensor, a second strain, present in a second position of the casing along a predefined second spatial direction, said second strain being dependent both on the normal force (Fn-eff) and on the tangential strain (St-eff) acting on the casing; - generating, by the fiber-optic strain sensor, a first photonic signal, representative of the first detected strain, and a second photonic signal, representative of the second detected strain; - receiving said first photonic signal and second photonic signal, by an optical reading/querying unit, optically connected to said fiber-optic strain sensor; - determining, by the optical reading/interrogation unit, the value of the first strain and the value of the second strain, on the basis of said first received photonic signal and second received photonic signal, respectively; - determining a measurement of the clamping force and/or of the braking torque based on the determined values of said first strain and second strain.