Strange Noise when braking

[Mick]

Since this cold weather ( -5C) in the UK, I get a strange groaning noise when braking heavily just before I stop, its OK after a couple of miles when the tyres are warm, anybody got any idea's ':?'
My Megane II is shod with Continental Premium Contact 2 on the front - tyre pressure 33 PSI, 6mm tread ,not damaged, brakes 50% worn, tracking OK

[Jonault]

Noisy brakes are common on Meganes but they usually squeal rather than groan. Besides changing the pads to Greenstuff, I'm not sure what the cure could be.

[walibe]

Yeah my old Meganes would groan, particuarly during decent braking. I was wondering if something was wearing out (brake pads were fine when checked) but as the car was written off I will never know.