brakeThere are many situations, different cars, different braking techniques, different roads, of course, different braking techniques, even the same car, the same road, different speed (Tempo), there are different braking methods, I mainly today Talk about the basic knowledge and basic skills of road vehicles braking on the highway.
One: Basic knowledge:
1: The front wheel brake is faster than the rear wheel brake.
2: The front wheel brake is safer than the rear wheel brake.
3: Two-wheel braking is faster than one-wheel braking.
4: Dry braking is faster than wet braking.
5: Asphalt roads are faster than cement roads.
6: Please don't try to brake.
7: Please don't brake in the curve.
Let me explain one by one.
1: Braking during driving, the rear wheels cannot give you enough friction to stop you faster, while the front wheels can, because using the front brakes during driving will transform the forward inertia of the car into downwards At this time, the front wheel will get more friction than the rear wheel, so that it will stop faster.
2: When driving with a slight force (especially at high speed), the rear brake will lock the rear wheel and cause side slip. As long as you do not use excessive force to brake the front wheel, it will not produce Sideslip (Of course, the road should be clean and the car should be upright)
3: It is easy to understand, using two brakes is definitely faster than using only one brake. (It's nonsense)
4: Dry roads brake faster than watery roads, because water will be ontireA water film is formed between the ground and the ground, and the water film will be reducedtireFriction with the ground. One more thing, wet tires have a lot more grooves than dry tires (drainage grooves) for draining water. This can reduce the production of water film to a certain extent.
5: Cement pavement has less friction for tires than asphalt pavement. Especially when there is water on the ground. Because asphalt roads are rougher than cement roads.
6: Point brakes have higher requirements for the car. Similarly, the requirements for drivers are also higher. Of course, you can try, but point brakes have little meaning for road vehicles.
7: In the corners, the adhesion of the tires to the ground is already very small, and a little hard braking will cause sideslip and crash.
Two: Basic skills:
1: At High Speed, the force of the front wheel brake must be greater than the force of the rear wheel.
2: At high speed (High Speed), the force of the front wheel brake must not make the front wheel lock.
3: When braking uphill, the braking force of the front wheels can be appropriately greater.
4: When braking downhill, the braking force of the rear wheels can be appropriately greater.
5: During emergency braking, the braking force is slightly less than the locking force.
6: When braking on a slippery road, the rear wheels must be braked before the front wheels.
Let me explain one by one
1: The distribution of braking force during high-speed braking, generally 60-90, the front 6 rear 4. 90 or more, the front 7 rear 3. 120 or more, the front 8 rear 2. (Of course, not absolute)
2: It's easy to understand. If the front wheel is locked, it will be somersault, ha ha.
3: When going uphill, the front wheel is higher than the rear wheel, so the front brake can be used more appropriately.
4: The above one is reversed.
5: Because after the tire is locked, the friction will decrease. The maximum friction of the tire is when it is about to lock, but there is no critical point for it. There is no way to explain it more clearly, which is too troublesome.
6: Use the front brake first on a slippery road. It is very likely that the front wheel will lock up, and the result will definitely fall, but the rear wheel will lock up. (As long as the frame of the car is upright and the front of the car is upright), it is generally impossible to fall. It's very simple.
Finally, I added that you should never expect to get enough braking force in a curve. The reason is described in Article 7 of Basic Knowledge. So what should I do if I really need to brake in a curve? Remember, your first thing is not to brake, but to straighten your car.
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