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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.
What you're describing sounds like "disk brake chatter". It's a condition caused by warped rotors. Rotors often warp when they're old and/or have been overheated.
It's PROBABLY warped disk brake rotors. Brake rotors will warp when overheated and if you go downhill very often, they've probably overheated. Replace the rotors with a high quality product and they'll last longer.
Whenever they are warped, damaged or worn down to the minimum limit. Your local auto parts store can measure your rotors if you bring them in off the car.
This depends on the vehicle. However, if you notice your steering wheel shakes when you apply your brakes, your rotors may be out of round. They can be resurfaced by a mechanic, usually only once because they will become too thin. If you have any concerns, ask your favorite mechanic.
Disk brake rotors will warp when the overheat. Riding the brakes, a lot of downhill or other heavy, continuous braking can result in an overheated rotor which can cause brake pulsing. Some call it 'brake chatter'. Often the rotors can be "turned" to make them even again, but if the rotors have worn down already or if the manufacturers specs have been exceeded, turning won't be an option and you'll need to buy new rotors. You can't inspect them to determine if they're warped, but if the vehicle has brake chatter, the rotors are warped.
Remove the brake rotor and have it checked at a reputable auto parts retailer. Rotors often warp with age, especially if they have been overheated.
Depends entirely on the type of use they get how heavy the car is ,if they are left to rust over a period of time.but often two to three pad changes.
Maybe never,But if you let your brake pads wear out to where the brakes are grinding,You may have to.
when there is a visable rigde / lip on the edge of the disc (rotor) when there is a visable rigde / lip on the edge of the disc (rotor)
There really is no set time or even mileage. If good quality brake pads and s hoes are fitted, they will last a long time. Most disc brake pads have 'squealer' plates, these are thin tin plates that screech when your pads need to be replaced. I like to keep a good eye on all essential features of my car, so I take off the wheels and check my pads and shoes at least twice a year.
once a year