When they are warped or worn beyond legal limits.
They need replaced when they wear out.
From a rotor spec sheet, find the minimum thickness, from there take about a micrometer and measure. If it is below the minimum then you need to change your brake rotors. Rotors do not generally need to be replaced unless there has been extensive damage to them from driving on extremely worn down break pads. If you waited too long to change your break pads then you may want to consider replacing them. If not, you don’t need to worry about it.
When Brake Rotors Are To Thin To Turn On A Brake Lathe To Have The Minumn Thickness. They Need To Be Replaced.
They could if worn or warped to the safe and legal limit.
No just the bad one.
The first question you need to ask is whether you need new rotors or if you are replacing old ones. That is a huge difference in price. Assuming you need replacements, simply go to the Brembo website and it should be as easy as matching the model for your vehicle. Newer rotors can be expensive and are available at a variety of locations.
Your brake rotors are warped and need replaced/resurfaced.
Your rotors are warped. You need new brake pads and the rotors turned at a machine shop or replaced.
The Honeywell filter should be replaced every 8- 12 months or as needed.
depends on the condition of your old rotors. Buy what you need.
If you are wondering whether it is possible to replace one's own brake rotors or not because you drive an older vehicle that need brake rotors replaced, then the answer is no.
Most of the time, you can get by with just replacing the pads. The rotors generally do not need to be turned if there is no pedal pulsation or vibration. Rotors will need to be replaced if the exceed the minimum thickness which is stamped on the web (area with lug holes).