Changing rotor and brake pads?

I wanted to replace my rotors and brake pads but have not been able to remove the bolts that hold on the brake assembly. I have put WD40 on bolts plus tried a hammer hitting the socket wrench to try and jar it lose to get started. There is not enough room to get a good size pipe onto wrench to really put some pressure on it. I have changed pads and rotors on several cars in the past but never had this problem.