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In the framework of the instanton vacuum model we make expansion over thecurrent mass $m$ and number of colors $N_c$ and evaluate ${\cal O}(1/N_c, m,m/N_c, m \ln m/N_c)$-corrections to the dynamical quark mass $M$, the quarkcondensate $<\bar qq>$, the pion mass $M_\pi$ and decay constant $F_\pi$. Wefound the SU(2) $\chi$PT low-energy constants $\bar l_3, \bar l_4$ in a goodcorrespondence with the phenomenology and lattice calculations.

Low Energy Constants of Chiral Perturbation Theory from the Instanton Vacuum