  The decays tau -> 3 pi + nu(tau) are analyzed at one loop order in the
framework of Generalized Chiral Perturbation Theory, in order to test the
sensitivity to the size of spontaneous chiral symmetry breaking parameters,
contained in the S-wave. The latter, due to a kinematical suppression, at
threshold, of the P-wave, is relatively large enough to be detectable at high
energy machines, through azimuthal left-right asymmetries. This quantity (for
the pi- pi- pi+ mode), integrated from threshold to Q^2 = 0.35 GeV^2, varies
from (17 +- 3) % in the standard case of large condensate up to (40 +- 5) % in
the extreme case of tiny condensate. The feasibility of such measurement at
high luminosity colliders (e.g. CLEO) is discussed. This method provides a
completely independent cross-check of forthcoming experimental determination of
the quark condensate, based on low energy pi-pi scattering.
