* Vibration: If you feel a vibration when braking, it could be a sign that your brake disks are warped. Warped brake disks can cause the brake pads to chatter and vibrate, which can lead to premature wear.
* Pulsation: If you feel a pulsation when braking, it could be a sign that your brake disks are unevenly worn. This can cause the brake pads to grab unevenly, which can lead to premature wear.
* Scoring: If you see deep scratches or grooves on your brake disks, it may be a sign that they need to be machined. Deep scratches or grooves can cause the brake pads to wear prematurely and can also lead to a loss of braking performance.
If you experience any of these symptoms, it's important to have your brake disks checked by a qualified mechanic. They will be able to determine if the disks need to be machined or if they need to be replaced.
In general, brake disks should be machined when they are worn to a thickness that is less than the manufacturer's recommended minimum thickness. The minimum thickness for brake disks is typically listed in the vehicle's owner's manual.
It's important to note that machining brake disks can only be done a limited number of times. Once the disks have been machined to their minimum thickness, they will need to be replaced.
If you're not sure whether your brake disks need to be machined, it's always best to consult with a qualified mechanic.
