We study in detail the prediction for the semileptonic decays B̄→D(D*)πν̄ by heavy quark and chiral symmetry. The branching ratio for B̄→Dπν̄ is quite significant, as big as (0.5-1)%. The branching ratio for B̄→D*πν̄ is only of the order of 10-4-10-5. Numerical results for various single-particle spectra and their dependence on the pion momentum cutoff schemes are presented in a series of figures, as are the model-independent ratios for differential rates of D and D*. We also study the parity-violation effects on the decay rates for different polarization states of the D*.