i experienced similar thing as well.. i had to replace brake pads on my car.. when the Mech. guy remove the pads and jiggle the caliper pins, it was rattling like hell.. so the Mech. guy was recommends to lathe it.. i went totally against it. cos we did the same thing to our Van (CR 27) it lasts like 8000 Kms after refill an lathe. went around Delkanda Area found the Entire Hub for 6000/- a piece (Brand new Brake pad set at Agents were 12,000/-) this contains almost new Pads, Disc and Caliper pins. got good results thanks to the cheap Recon parts.. lathe work doesn't work always because in lathe we are filling entire different metal into existing metal. there is a small difference between both so it tends to wear bit higher than the original Metal that existed.