I have a 2011 Nissan Qashqui.

The brakes squeak so much that people turn their heads to see what the noise is. 

Occurs rain or shine, cold or hot. 

I have had the pads and discs changed, which made no difference? Last time it went for a service I informed the garage, who then proceeded to 'machine the pads' I think the guy said. 

Any ideas GZers?