What size is the socket to remove the center bolt for
the rotor on a 2006 Pontiac Grand Prix base model
Once you remove the caliper bracket the rotor should slide off the lugs. Sounds like it is rusted on..https://www.youtube.com/watch? v=Ep7NdZMn1mk
Then what is the center bolt in the middle of the rotor for
The center bolt only needs to be removed to replace the hub bearing or axle shaft. You do not need to remove it to replace the rotors.
Looking for a Used Grand Prix in your area?
CarGurus has 2,751 nationwide Grand Prix listings starting at $1,200.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts