I just got my dad to have a look at my car he thinks i need new pads although im not sure if having no pads could cause the howling?

Thanks for all your help so far guys x

HI, I have a Rover 200 s reg and over the past few months i seem to be getting a weird howling/ rubbing noise while im driving my car i dont get it all the time and only seem to get it when i have drove my car over 20 miles a day Its very strange it sounds like a ghost howling i cant describe it. It...