by Ae92typeX » Sat Feb 12, 2005 8:21 am
some calipers have a small view hole where you can see the thickness of the pad, some dont. It the pads are wearing even you can go down to the last mm without damage, but I wouldnt recomend going untill they make scraping noise as it will be time to machine the discs then. Most pads have a warning tab wich squeals when it is nearly worn. There are some cars on the market that if you let it wear right down the pad, or back of it, just falls off!- hapened to my mates mazda once.
generally I'd replace mine when there is about 2mm left.
If just normal day driving i'd put whatever your local car shop has on, but im aware that others here will have more spacific reccomendations on makes of pads.