How do you remove the front ABS tone ring on a Isuzu NPR to replace the rotors?

The ABS tone ring is pressed onto the back of the wheel hub preventing access to the bolts that hold the rotor on. I laid the whole hub and rotor assembly on the ground with the tone ring facing up. With an assistant we pry up on the ring with two 4' pry bars. Then we rotate the pry bar around in different positions prying up as we go along. The ring should slide right off. After replacing the rotors, I put the rings back on with a brass punch and a little anti-seize.

(Powerstroke57 answer) For starters the tone rings don't "just slide off." To get the ring moving takes allot of force. If you want to damage the teeth of the tone ring which can cause an ABS light to come on and now your buying 2 new rings for yourself or the customer do it the above way. A much better and safer way is coming up.

This is what i do every time and i have NEVER had any problems with damaging the ring or the abs light due to damaged teeth. Remove seal and bearing from hub. Using a torch heat ring until you can spin the ring around on the hub using a flat blade screw driver. Using 2 screw drivers under lip of ring push down on both screw drivers and ring will come up and off. With it hot the metal expands and very little force is needed to remove the tone ring. Change the rotor and if your lucky the ring will drop right back on the hub if it's still hot. If it has cooled enough and contracted re-heat until it drops and bottoms out. With it bottomed out spin a few times to confirm its seated. Repack the wheel bearings and by the time your done with the wheel bearing re-pack the ring will have cooled enough to be firmly secured around the hub. Using the screw driver again attempt to spin ring again. If doesn't it has cooled enough if it does spin just wait until you can't spin anymore. With this procedure their is little to no chance of damaging the tone ring. In my shop it's done this way and the only person in our shop that damages NPR tone rings is the new guys that doesn't do this procedure. Do it this way using heat is just fine. The ring will be ok. Good luck!