How's measuring thickness going to determine any warpage?
Dial indicator with magnetic base can find any runout, no need remove rotor.
Shit, put a new hose on and see if there is any pulsing in the brake pedal. Lets keep it simple
Except a lot of rotors these days come out of the box with excessive runout. It's actually funny if you do this and see the variances in most new rotors. Most will be within tolerance but I've seen some, like NAPA's True Stops, that are junk out of the box. From what a friend who walks for NAPA as an outside salesman - going from shop to shop on commercial accounts - NAPA's doing away with True Thumps.
One of the reasons I won't cut rotors. Had a service writer one time complain that I was replacing too many rotors when we should be cutting 'em. I chucked a dial indicator up on the lathe and called him over. Got him the specs on the rotors on the car I was working on. Spun the lathe up and the run out on the lathe was 2-3 times the excessive run out on the rotor specs. Looked at him and said, "
that's why I don't cut rotors." That and a lot of the rotors he wanted me to cut were warped because of excessive heat. Yeah, that's right, let's cut warped rotors for a customer who likes to ride his or her brakes down the hills and make 'em thinnner, so the customer can be back in within a week and we'll replace 'em for free.
Like most service writers this guy was mentally deficient anyway. The mark up the shop was making on new rotors was more than the labor charge on cutting them. Add into that the labor for brakes, the mark up on parts, the shop was profiting more and the customer was getting a better job. Oh, and we didn't have to comp some of the money back because he was warrantying brake jobs.
