Pads and Rotors

Strange about the groove! The rotor is not expensive consider that you are going to do brake by yourself. Don't buy the rotor or brake pads from Canadian Tire stuff. Get them from GM or try Auto Parts Extra for GM equivalent (AC Delco)

Here are the measurements out of a 95 Bonneville Book. Stock thickness: 1.260" Minimum thickness after refinish: 1.224" Discard Thickness: 1.209"

If they mic'ed thinner than 1.224 of an inch after you had them turned they should have been pitched. They also should of had no grooves in them after resurfacing other than that of a carbide cutter on a slow pass. If the grooves in them now were created by the pads you have on there you are okay. (That is if I understand correctly what grooves you are refering to.)

What I do is I get the Semi-Metallic pads that the guy behind the counter always says "eats up rotors" with the anti-squeal backing and then I buy the cheapest rotors. You can get cheap china made rotors for a bonneville at advance auto parts for $20-25 bucks each and wearever pads for $30. Compare that to the $80 some bucks each for rotors from the dealer. In my mind at that price I'd rather just buy new china made rotors rather than turning the old ones myself or getting them turned. If it was a non wear part or something I wanted to last I wouldnt buy china made. But since they all wear out the china ones will do. You might be able to have them turned once after the semi-metallic pads wear out.

Except the ones at the dealer don't warp quite as easily as the ones made overseas.