2006 Vauxhall Corsa Brakes Make Grinding Noise

Brakes problem
2006 Vauxhall Corsa Front Wheel Drive Manual 35000 miles

Hi There,

I have a Vauxhall 1.2 SXI 06 plate. When I start driving the car the first few times I touch the brakes it makes a grinding sound from the rear. After a few times braking the sound goes away. I initially thought it could be grit but not too sure as it goes away until I stop the car and start it again. It does not matter if the car is stoppped for a few minutes, hours or a day.

Any ideas much appreciated.

Thanks

John.