About Auto Parts
Braking
Brake linings on the brake friction coefficient for the impact? – Brake lining – Automotive repair a by jekky
Brake Friction coefficient of friction is too high or too low will affect the car’s braking performance. Especially the car at high speeds, needed emergency braking, low coefficient of friction braking will appear insensitive, but there will be too high friction coefficient Tire Locking phenomenon, which causes vehicle drift and skid, and Travel Pose a serious security threat. According to national standards, brake linings suitable working temperature of 100 ~ 350. But many low-grade brake lining in the temperature reaches 250, the friction coefficient will decrease sharply, while the brake will completely fail at this time. Generally speaking, in accordance with the SAE standard, brake lining manufacturers would prefer to use FF rated factor level, that is rated coefficient of friction 0.35 to 0.45.
Brake pad life and the relationship between the hardness of what?
Brake pad life and surface hardness of the relationship is not certain. However, if the surface hardness is high, brake linings and Brake Disc contact area is small, tends to affect the service life. Affect the life of brake linings factors including hardness, strength, friction materials Wear and tear And so on. In general, the former life of brake linings for the 30 000 km, after the service life of brake linings for the 120,000 km.
Braking Why would Shake Phenomenon? Often due to brake linings or brake disc caused by the deformation, which brake linings and brake disc of material, machining accuracy and the use of thermal deformation of the, mainly due to a brake disc thickness unevenness, the system dynamic drum circle difference, uneven brake lining wear, and hot spots such as deformation and heat.
In addition, the Brake Calipers of the deformation or improperly installed, and the friction coefficient of brake linings can cause braking instability jitter. In addition, if the brake linings produced in the braking and suspension system vibration frequency of resonance, it will also generate shaking.
After wading braking performance? As brake linings, after wading / shoes and brake disc / drum water film between the layer and reduce the friction will affect the braking effect, but the water inside the Brake Drum was not easy to shed.
For disc brakes, this braking effect wading for the impact will be lower, because the disc brake brake lining contact area is small, and is exposed, water droplets will not persist. As the wheel rotates, centrifugal force in the role of water droplets on the brake discs will soon be lost, as long as wading kicks after the slam on brakes will remove the residual water layer.
But for drum brakes, in wading walking step after the brake must be that the side step Accelerator Step brake side, after several consecutive can be between brake shoe and brake drum of water evaporated, and then restore the braking effect.
To What the noise generated when braking?
Braking noise generation is mainly due to the hoisting system components of the resonance or mutual interference caused. But there are as improper use of the brake disc or deformation of materials, brake linings hardness, porosity, friction properties and compression characteristics of failure, brake linings and brake disc wet rust (only a few can brake recovery), brake lining formulations of metal wire is too hard, brake lining wear warning, and mechanical disc brake lining causes such as scraping noise or screaming. Why
What newly installed brake brake lining has a softening phenomenon?
In the replacement of the brake lining brake may occur after the softening of the phenomenon, there may be two reasons: to install sub-standard brake lining, brake disc surface contamination without cleaning, the brake pipe there is a fault or Brake Fluid Insufficient, incomplete exhaust brake hydraulic cylinder, excessive wear and the brake disc surface smooth, and the inferior quality brake linings.
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