Hello!
There are three major things that factor into front pads wearing down that fast.
1. bad front calipers... they could be sticking causing the front pads to wear down quick or causing the front pads to wear uneven.
2 back brakes not working good or not working at all. If you have rear drums brakes, be sure that they are adjusted up.
3. lead foot driving. Either stepping on the brake pedal hard and or consistently while driving or driving two footed... one foot on the gas and one foot on the brake pedal causing the brakes to be engaged ever so slightly.
Sorry for the delay!
I just did two different searches for this vehicle about the brakes and did not come up with anything for the brake system nor have I heard of any pattern failures with the master cylinder or proportioning valve. However, this does not mean that this is not a possibility.
Pontiac Technician
ASE MASTER TECH WITH L1 CERTIFICATION
THanks for the accept!
Please let me know if you have any further question!
Good luck!