A disc brake is a type of brake that uses calipers to squeeze pairs of pads against a disc in order to create friction that retards the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion is converted into waste heat which must be dispersed. Hydraulic disc brakes are the most commonly used form of brake for motor vehicles but the principles of a disc brake are applicable to almost any rotating shaft.
There are three main types of bike brake discs: fixed, fully floating & semi floating.
Fixed Disc Brake
A fixed brake disc is a one piece brake disc. That is, its brake cushion contact face and wheel mounting face are all part of similar bit of metal. They are generally cheap to create and they perform impeccably well inside specific parameters, yet in the event that they are subjected to serious heat then they can’t widen or extend in light of the fact that they are not floating.
Fully-Floating-Brake-Discs and Semi-Floating-Brake-Discs
Both fully-floating-brake-discs and semi-floating-brake-discs are built in two sections. An aluminum focus part which is attached to the bike wheel and a stainless rotor part which the brake cushions push on.
At the point when the rotor is subjected to serious heat it extends. By permitting it to float independently from the mounting face it is allowed to grow and contract again freely without being restricted by its mounting. At the point when this development happens it does so in all directions at once and it won’t be restricted. If you keep this from happening in one direction (by settling it on its mounting face) it must choose the option to twist, so floating-discs and semi-floating-discs are made in two sections to permit the plates to extend and keep them from distorting. This is mainly a high performance type brake disc.
Motorcycles of more moderate performance can utilize fixed brake discs happily and you will likewise observe that most rear brake discs are fixed. This is on the grounds that they aren’t used as much and therefore subjected to as much heat. Most rear brake discs are thicker than front brake discs and this is a trade off in light of the fact that the cooling is not as good as the front discs. They don’t get as hot yet don’t cool as easily also, so the thicker material keeps them from distorting.