  We describe a big brake singularity in terms of a modified Chaplygin gas
equation of state $p=(\ga_{m}-1)\rho+\al\ga_{m}\rho^{-n}$, accommodate this
late-time event as an exotic quintessence model obtained from an
energy-momentum tensor, and focus on the cosmological behavior of the exotic
field, its kinetic energy and the potential energy. At the background level,
the exotic field does not blow up whereas its kinetic energy and potential both
grow without limit near the future singularity. We evaluate the classical
stability of this background solution by examining the scalar perturbations of
the metric along with the inclusion of entropy perturbation in the perturbed
pressure. Within the Newtonian gauge, the gravitational field approaches a
constant near the singularity plus additional regular terms. When the perturbed
exotic field is associated with $\al>0$ the perturbed pressure and contrast
density both diverge, whereas the perturbed exotic field and the divergence of
the exotic field's velocity go to zero exponentially. When the perturbed exotic
field is associated with $\al<0$ the contrast density always blows up, but the
perturbed pressure can remain bounded. In addition, the perturbed exotic field
and the divergence of the exotic field's velocity vanish near the big brake
singularity. We also briefly look at the behavior of the intrinsic entropy
perturbation near the singular event.
