12-01-13, 03:14 PM
At 16,000 miles you can expect some grooves to have developed. It does affect the bedding-in period of new pads slightly, but shouldn't be much of a problem assuming the disc is not at the wear limit of 3.5mm.
Checking the disc thickness is a bit of a fiddle since you need to measure the thinnest portion and the edge of the disc will be full thickness. I glue a couple of small ball bearings to the blade of a vernier caliper to give an accurate reading. Alternatively, they're cheap enough tools that you could buy one and grind sections off to give a measuring area that's small enough to get down into the grooves.
I normally expect about 35,000 miles from front discs, but riding styles (and pads) vary.
Checking the disc thickness is a bit of a fiddle since you need to measure the thinnest portion and the edge of the disc will be full thickness. I glue a couple of small ball bearings to the blade of a vernier caliper to give an accurate reading. Alternatively, they're cheap enough tools that you could buy one and grind sections off to give a measuring area that's small enough to get down into the grooves.
I normally expect about 35,000 miles from front discs, but riding styles (and pads) vary.