Hey guys, im planning on buying a used twin pot brakes for my perodua car. Brakes have custom brackets and will fit just right into my car.. Just wondering if anyone have experience in buying half cut/recon/used brake kit set for their cars. 1) Anything i shld check or take notice of when purchasing these brakes? 2) how to check the rotors, pads for wear or damages. 3) how to determine the lifespan of the rotors. 4) how to check the calipers? Your advice are highly appreciated! Thanks!