  We present analytical and numerical results that demonstrate the presence of
the Braess paradox in chaotic quantum dots. The paradox that we identify,
originally perceived in classical networks, shows that the addition of more
capacity to the network can suppress the current flow in the universal regime.
We investigate the weak localization term, showing that it presents the paradox
encoded in a saturation minimum of the conductance, under the presence of
hyperflow in the external leads. In addition, we demonstrate that the weak
localization suffers a transition signal depending on the overcapacity lead and
presents an echo on the magnetic crossover before going to zero due to the full
time-reversal symmetry breaking.We also show that the quantum interference
contribution can dominate the Ohm term in the presence of constrictions and
that the corresponding Fano factor engenders an anomalous behavior
