Fingers: If the width of a human finger is 2.2 cm (7â8 in), then a million fingers lined up would cover a distance of 22 km (14 mi). If a person walks at a speed of 4 km/h (2.5 mph), it would take them approximately five and a half hours to reach the end of the fingers.
The rotors on a vehicle can last anywhere from 30,000 to 70,000 miles and sometimes more. A licensed mechanic, such as one from YourMechanic, can evaluate the rotors and advise you on their status; they may not need to be changed as often as the brake pads. Like brake pads, they should be replaced in pairs.
The pads need replacement on disc brakes on a regular basis. How often they need to be replaced will vary depending on your driving habits. The accepted lifespan of the front disc brake pads is roughly 30,000 miles. This can vary greatly though. If you drive the vehicle hard and ride the brakes, the pads may need to be replaced in only 10,000 miles. The rear brake pads should last twice as long as the front disc pads. Again, this will vary depending on how you drive.