piston needs to be pushed further..
I saw the DIY. If you have the caliper off the car and sittin on the box, then you can push is further.

It other words take the caliper off again and use a c-clamp to push the piston further.

sometimes when you compress the piston back when its still on the car, it doesn't push it far enough. take off the caliper, and compress the piston till it bottoms out.

also note: this procedure is for the front ONLY. the rear disk piston is different.