Brakes die plate several reasons:
Raw material problems: brake pads in the mineral fiber scum will scratch the brake disc, slag in the mineral fiber is more likely to produce noise.
Easy to scratch the raw material plate is artificial graphite, artificial graphite itself is very soft hardness, silicon carbide impurities inside the hardness close to diamonds, enough to scratch the brake disc. Brake with artificial graphite, most of the small plant is used Recycled waste graphite (recycled graphite will never be used in big brands), and some industries have no effect on the presence of silicon carbide in graphite, but silicon carbide is a very harmful substance when used in brake pads.
Brake material problems in the same batch should have a problem, may be involved in the surface will be relatively wide. In this situation, the brake must be promptly replaced, if the brake disc damage, it will have to change the brake disc.
Occurrence of this situation is generally symmetrical two brake disc 4 friction surface simultaneously chew groove situation, and the groove irregular position, may be high may be low, it may be all the groove.
Brake pad accessories will also be drawn out of the slot. Some brakes have a warning film (alarm film is generally stainless steel), when the brake pad to the alarm position, the brake when the warning film will brake friction, and Issued a shrill scream to remind the owner to change the brake pads.If the owner did not care about this sound, let the warning tablets and brake pads grinding, the brake disc will be scratched.This kind of pit will generally only appear a slot, Not serious for a direct brake pads can happen, this situation occurs, the general position of the brake disc slot, is the location in contact with the alarm sheet.
Brake discs are gnawed by the mounting problems Brake pads, if installed unevenly, cause one or all of them to contact the brake pads for an extended period of time, resulting in high temperature friction between the brake pads and the brake pads for a long time, in which case braking is liable to occur The disc is chewed slot, and there will be a lot of slots, this situation easily appear on the rear brake, someone hand brake when driving did not put, or hand brake did not put in the end, resulting in a long time drag brake pad, easy to form this reason. Discs see the plate discoloration in the long-term high temperature, if the time is long must replace the brake disc. Brake pads are not installed flat, there will be gnawing on the disc surface. And brake pads and brake disc surface contact area is wide, slot position How wide, in such cases can not be eager to replace the new brake pads and brake pads, there may continue to be wounding phenomenon, you should carefully check the brake caliper where a problem.
Why brake pads will draw grooves in the plate, from the structure of the brake pads and the composition of raw materials Speaking:
Brake body is generally divided into two parts: the friction layer and the steel back, the quality of brake pads is good and bad The main difference is in the friction layer, the friction layer is a composite material, organic fibers, inorganic fibers, mineral fillers, phenolic resin mixture Composition, after high temperature and pressure, hot forming. Now many brake pads will be divided into two layers of friction material, the bottom material and surface material, the bottom material in the steel back and surface material in the middle of the brake pads during use , Will first wear the surface layer material, and then wear to the bottom of the material, and then worn to the steel back, the brake pads should be worn before the end of the fabric material before the end of replacement.
Brake pad itself caused the brake disc scratches, brake lining layer contains mineral fibers, mineral fibers melt by a variety of minerals after spinning through the formation of fiber, but the mineral fiber spinning process at the same time, some did not Can be sprayed into fibrous, and some form a small ball (called "slag ball") The ball hardness than the fibrous ore is much higher will cause injury brake disc problems. After the production of mineral fiber, slag ball The content will be as high as 40% ~ 50%, the big brand enterprise will carry on the screening.It will improve the purity of the mineral fiber to about 95% ~ 98.5%, but still will contain 1.5% ~ 5% slag ball (now the craft can not Slag ball all removed.) General disc material used in the layer of mineral fibers are of this type will inevitably contain a small amount of slag ball will cause damage to the brake disc if the brake lining layer contains too much Slag ball, the brake disc will be drawn out of the slot, in serious cases, the need to brake pads and brake disc replaced together.
Man-made cause brake disc scratches, the friction layer is divided into the fabric layer and the end of the material layer. Brakes will first wear the fabric layer, and then wear to the end of the material layer. The role of the primer layer and the fabric layer, To improve the bonding strength, thermal insulation.Because the design of the formula, the focus is not on the friction performance, the material used and the fabric layer is different.The fabric layer used in mineral fiber content of 95% to 98.5%, in the primer layer, You can use the high content of slag ball mineral fiber (cheap) may slag content of 10% or 20%, some manufacturers in order to improve strength and reduce costs, the use of glass fiber. For high-quality enterprises, but also in the At the end of the material layer to increase the strength of aramid fiber brake pads need to regularly check the thickness of the fabric layer has been worn over the fabric layer after grinding and brake disc friction is the end of the bottom layer of the material layer is not friction As the main function.If you do not replace the brake pads, a long time may cause the brake disc to form a groove. (Now many brake pads have a warning line when the friction to the alarm line will hear the obvious sound, This time you need to change the brake pads, when listening to screams have been injured.)
In fact, the brakes in the hard material and stop fiber in a ball, a glass fiber in the brakes generated when the glass beads will form the state of the ball, the hardness is also very high, ceramic fiber also has a ball, a lot of natural Mineral padding may also contain impurities, so the brake pad regular manufacturers choose the material used less or even without the hard material of raw materials such as glass fiber, in the disc is no longer used.But like minerals Fiber, one of the main body materials for brake pads, is not yet replaced with a better material.
