Typically rotors come from the factory covered with a waxy material to prevent rust. Yes, it's a good idea to remove that material before using the brakes.
No, unless they are rusted.
There was a lot of squeaking while braking when my car needed new rotors.
If the rotors are in good condition, not warped, not scratched, then you can replace the pads without turning the rotors. Inspect the rotors carefully.
You probably need new rotors
remove tire calipers brake assembly then pull your rotors off i would recomend putting new brake pads if your putting new rotors you will need a special puller for the rotors cause they are pressed on
I just replaced mine, rotors had rusted away. Remove caliber, mine were rusted to the wheel hub, had to pry off. cleaned old rust off with steel wool, new rotors slid on with no problem
you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. you may need to check your vents and see if they need cleaned or... you may need a new filter. COZ IT MIGHT BE AN AIR-CON!
The majority of the stopping power is performed by the front rotors. I would start by replacing them.
the only other parts you might check when you have it pulled apart,are the wheel bearings.the bearings etc are in the rotors but do not come with them when you buy rotors.if you are not careful you will trach the bearing races and seal on the back side of rotors when trying to remove them to install in new rotors
I don't know if you are saying you have the new hubs and rotors and still have pulsation, or if you are asking what causes pulsation. If you have pulsation on slowing this is due to warped rotors, and you need to change the rotors and the brake pads, not the hubs. Not too expensive: 2 rotors and brake pads for my Pontiac is about 55 bucks. DIY of course.
As long as your rotors are not warped, or you have not let the brake pads wear to the point they defaced the rotors, there is no need to change them. Just install new brake pads. Rotors can last the life of the car.
Your rotors are warped. You need new brake pads and the rotors turned at a machine shop or replaced.