is a brake lock (either a disk or hub) to intensify the tire, the tire is no relative movement for the brake. In other words, do not turn the tires, the car is like a brick as sliding surfaces.
locking hazards: tire locking There are two major hazards.
First, two types of friction, called rolling friction, called sliding friction. Compared to sliding friction, rolling friction coefficient larger, so when car tires do not lock when braking ability death would surely hold strong, close and lock in when maximum braking efficiency.
Second, if locking the front than the rear first, the car will lose steering capability. Simply put, if it is to slide a brick in the road, it is no way to change their own sliding direction. If the rear than the front wheels locked first, it will cause skidding. So lock is very dangerous.
ABS is mounted to the wheels from locking during braking to solve this problem, there is no car installation ABS, if the brake pedal force, wheel speed will rapidly decrease during traveling, the braking force when the wheels and the ground exceeds when the frictional force, the wheel will be locked, fully locked wheel tires will decrease friction with the ground, if the front wheels are locked, the driver can not control the traveling direction of the vehicle, if the rear wheels are locked , it is very prone to sliding phenomenon. ABS speed sensor installed in the vehicle in case of emergency by being mounted on each wheel or shaft rotational speed constantly check voltage for each wheel, then the calculated wheel slip rate by a computer (a slip ratio understand the car rope whether the wheel has been locked), and compared with the desired slip ratio, a decision to increase or decrease the brake pressure, the hydraulic pressure controller instructs the regulator to reduce the wheel brake cylinder, the braking is reduced moment, after a certain time, and then restore the original hydraulic pressure, so that the constant cycle (up to 5 to 10 times per second), the wheel is always in rotation and have a maximum braking torque. Accordingly, ABS apparatus can always maintain the wheel in a rolling state of a weak brake slip, without locking, the purpose of improving the braking performance.
However, in some stunt scenes in the movie, some of the car is not equipped ABS, so we can see them more difficult skid, drift and other stimuli scene. For some want to pursue advanced driving exciting gameRiders, they also do not like to give the car fitted with ABS. After all, one o’clock, ABS is not for super senior actor and racing driver design, but for general motorists to ensure their driving safety. In the 1990s most talked about car configuration belong to the ABS, that was the Jetta, Santana does not say that every car must have, but up to now, ABS has been part of the basic configuration.