dude, when mehran comes from the showrooms, they have been run something like 150km's @ testing and running and the company mis-uses the cars at that time!!!
Of course, theres always a factor of 2 number brake pads, but changing the pads gets rid of the problem!
And yah, I'll advise you to change the tyres, the GENERAL ones cuz they suck and screach too!!
Cheerz!