  We numerically investigate the critical behavior of the synchronization
transition of two unidirectionally coupled delayed chaotic systems. We map the
problem to a spatially extended system to show that the synchronization
transition in delayed systems exhibits universal critical properties. We find
that the synchronization transition is absorbing and generically belongs to the
universality class of the bounded Kardar-Parisi-Zhang equation, as occurs in
the case of extended systems. We also argue that directed percolation critical
behavior may emerge for systems with strong nonlinearities
