[en] The three components of the isospin triplet in the axial part of the weakly charged and neutral currents have been first observed in one experiment when studying coherent π-meson production in the neutrino and antineutrino interactions with freon nuclei. The following estimations of the corresponding cross sections of the π-meson coherent production: σ_coh^ν(π⁺)=(106±16)x10^-40, σ_coh^ν(π^-)=(113±35)x10^-40, σ_coh^ν(π⁰)=(52±19)x10^-40. The experimental data are found to be in agreement with the theoretical predictions, based on the standard model of weak interactions. The constant of the isovector axial-vector weak current β=0.99±0.20 has been defined