Well Not really a question about acer computers is it?
Pads are very easy to replace,
1. Odviously 1st thing you do is get the front wheels off.
2. unscrew the master cylinder cap (found under the bonnett)
3. undo the caliper supporting bolts and remove caliper.
4. Pop the pads out of caliper.
5. push/WIND back the caliper piston ( note if you caliper is the winding type it will have 2/4 indents/slots- If these slots are present DO NOT push the caliper back)
6. Pot the new pads in place.
7. Reattach the caliper
8. put the wheels back on
9. and your done.
BEFORE YOU DRIVE THE CAR MAKE SURE YOU PUMP THE PEDAL UNTIL IT BECOMES SOLID. OTHERWISE YOU WILL NOT BE ABLE TO BRAKE.
BRAKE SPEC ASIF, July 2007