c4 squeaking brakes

hello, since a few weeks/months my brakes squeak sporadically, which is animally annoying (especially with lowered windows) anyway I left my c4 coupe today in the workshop..the end of the song: they cleaned it again (as at the first inspection at 2500km) and in order to be allowed to continue working (he mentioned somehow brake stones..kA more) he needs a permit from citroen. he has submitted the application, but that can take a while. how can I see? with your c4 off? my current km-stand is 4400 km and was built the jewel middle april 06.. I think I have already read something..but am not sure. our citroen dealer here is very small and not up2date I fear… many thanks