From a scientific point of view, rotors or brake discs in tandem with brake pads slow down by converting kinetic energy into thermal energy, which slows down the speed of rotation of the disc, and at the same time the wheels. As a result, the car can stop safely and the driver can effectively calculate the distance to objects that are in the way.
The first ones had a metal plate, which had no cooling or heat dissipation except for forced airing. Over time, engineers have found that implementing a heat sink reduces the temperature during braking and at the same time increases its efficiency. The heat removal was realized by means of special ventilation ducts as well as through holes located perpendicular to the working surface.
In addition to ventilation ducts, cooling is facilitated by the wheels of a certain configuration (usually spoke), as well as special air intakes located in the front of the car (bumper, fenders, diffusers). In addition to effective cooling, the perforation of discs allows you to clean the working surface from the remnants of dust and dirt from friction lining.
In most cases, cast iron is used to produce brake discs, but more and more alternative solutions have recently emerged. For example, carbon and ceramics are used to produce brake discs for high-speed cars.
How much does it cost to resurface a rotor?
The specificity of the rotors’ operation provides for heavy loads, as a result of which the working surface wears out due to high temperatures and friction. The thickness becomes less, there are grooves and irregularities, resulting in some or other troubles. Of course, much depends on the driver, or rather the way he rides. Too frequent acceleration, alternating with braking, leads to heavy loads lead to premature wear and tear and failure.
In general, there are quite a few reasons for wear of the brake disc. Thus, the speed of wiping is influenced not only by the way the driver rides, but also by the quality and composition of brake pads. If with the first it is more or less clear, with the second it is much more difficult.
The fact that the composition of friction linings, as well as the brake discs themselves, is a secret and each manufacturer has its own “recipe” for this product. However, it often happens when the disc and pads do not fit each other, that is, they are incompatible. The result will be either that the braking will be ineffective or that unpleasant sounds will be heard during braking (squeaking, grinding, etc.) or that it will wear out faster than specified by the manufacturer.
Many car owners use resurfacing as a way to prolong its service life. The resurface work can cost you somewhere between $235 and $329. However, sometimes it is cheaper to replace it.
How long do resurfaced rotors last?
Brakes are one of the most important systems in car design. It depends on the technical condition of the system whether the car can quickly reset and stop in any emergency on the road. In addition, these system parts are among the most loaded parts of the vehicle.
Each time they are braked, they are subjected to heavy loads proportional to the weight and speed of the vehicle and to heavy wear and tear. Therefore, they belong to the category of “consumables” – components that need to be changed regularly and in time to ensure the safety of the driver, passengers and other road users.
The service life of your resurfaced rotors depends on a number of factors such as car size and driving style.
Is it bad to resurface rotors?
Rotors on cars are the heart of complex braking systems. Only with perfectly smooth parts does the braking path feel minimal and the steering wheel and pedals are free of vibration.
Before you start repairing them, make sure that they are indeed repairable. There are a number of defects that make sure that the rotor has to be replaced.
Among such defects, first of all, are the deep cracks that can lead to the disk collapsing. The cracks usually appear because of strong overheating with the subsequent fast cooling. If the cracks are shallow, i.e. surface cracks, you can try to remove them with a duct, but it is impossible to guarantee full suitability of a disk for work. After all, there is always the possibility that invisible to the eye cracks still remain.
One more limitation for repair is minimum thickness, which is usually regulated by a car manufacturer. And not without a base, as if you make it too thin, it is capable to warm up too strongly and quickly to such temperatures at which friction material of a shoe does not provide required efficiency of brakes. It is therefore necessary to assess the thickness before running it, which will be obtained after repair.
You should be aware that resurfaced rotors require certain operating rules. After repairing the discs, a gentle operation of the vehicle is required.
Is it cheaper to resurface or replace rotors?
Of course, it is possible to repair rotors if it is not too wear out. Otherwise you should consider to so the replacement, since the cost is practically the same.