Vauxhall Corsa grinding front brakes

Is it actually the brakes grinding or the ABS kicking in. Also it could be the pad retainers that maybe rubbing against the calipers...

hello there, thanks for the reply. the problem with the grinding of the front brakes started from day one when i purchased the vehicle. (new) the vehicle went back to the agents the next week. after a long story of replacing discs pads twice, then disc's and pads. still the same problem. i am now forced to purchase after market disc pads to solve the problem. what i really wanted to know is if anyone has experienced the same problem. oh and sorry i am from south africa, (capetown) here i have spoken to four people whom have had the same problem. only this model of vehicle. the OPC in the same shape has no problems due to its upgrades braking system. maybe its just or GM in south africa is fitting poor quality products to our vehicle's.