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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.
According to customer reviews the best brake pads and rotors are EBC brake rotors and pads. They are manufactured in Britain and can be found at any auto store including Canadian Tire in Canada.
Aggressive driving.
pads
Brake calipers are the hydraulic devices that wrap around the rotors and pinch the brake pads into the rotors when you stop.
Some as the pads and rotors break in but it shouldn't be excessive.
Possible wrong rotors???
You do not need a torque wrench when replacing brake pads and rotors. Some of the tools needed to change the rotors and pads are the c-clamp, sockets, wrench, grease, and brake cleaner.
no
When rotors need to be changed usually the pads have worn down. It is always a good idea to change pads when changing rotors.
Replace the pads, and the rotors. You need to change the brake pads and the rotors.
Volvo pads and rotors are the best ones to use. Most aftermarket pads and rotors seem to make braking noise