The energy spectra of π0 in Kμ3+ and Ke3+ decays, and the energy spectrum and longitudinal polarization of μ+ in Kμ3+ decay have been calculated by the dispersion relation method on the assumptions that 1) the weak interaction is of a universal V-A form and 2) the strange vector current is not conserved. Consequently one subtraction is made for each of the dispersion relation for the form factors f0 and f1. Only the contribution of K1* (m* = 888 MeV) intermediate state is considered in the calculations. If the parameter defined in the paper is assumed to be equal to 2.1, the results agree with experiments within their limits of errors. Thus, better agreement with experiments could be achieved by abandoning the assumption of partially conserved strange vector current.