I am facing the same problem. I changed the front pads and got malaysian for 1200. After 5000 km high pitched sound started coming from brakes. This sound usually come when the pads are about to finish.... There is a pin that rubs against the disk to make the sound to indicate that pads need to be changed
I bought new Japanese pads (advics) for 4800 and got them installed. The previous break pads were not even half consumed. Anyways the high pitched sound is still coming from breaks when i drive the car after a long interval.
Disks are in prestine condition. I think the culprit is may be rear break shoes.
My car is Alto Works