  Braking indices are used to describe the evolution of pulsars rotation, and
can offer insights into the braking mechanism that dominates the slow down.
Here we discuss the main difficulties associated with measuring braking indices
and the complexity of interpreting these measurements. Considering recent
braking index measurements on pulsars with large and regular glitches, we
comment on the significant effects that the loosely coupled superfluid inside
pulsars might have on their spin evolution.
