[ally]

The bearings can wear and produce movement. Although no adjustment is possible, retorqueing the bearing nut can reduce the play.

It could be worn brake pads, or the pads could be tight in the caliper carrier. If so remove them and fill away the brake dust and corrosion to allow a sliding fit.
The other thing is static build up. Fitting shims were developed for applications which tend to produce brake noise. Also, copper grease on the rear of the pad should stop any humming or constant squeaking in this sort of situation.

 

[ally]

It can come from some brands of pads more than others. Also, driving technique can affect the brake noise. Ford circulated a technical bulletin a while ago to say that very light prolonged check braking can produce a glazed pad and hence noise just the same way that an overheated lining can! Moderate braking is the order of the day. :lol: