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.
During normal usage of the brakes, brake pads wear out and become thinner. If the thickness of brake pads is less than 3mm, it is time to change the pads. Depending on where you drive (city driving tends to wear pads out quicker) brake pads usually last between 30,000-35,000 miles.Some vehicles (eg. BMWâs) are equipped with a low-pad-warning system.f the thickness of brake pads is less than 3mm, it is time to change the pads. Depending on where you drive (city driving tends to wear pads out quicker) brake pads usually last between 30,000-35,000 miles.