market dynamics
Do you want to use the rear brake or not?
Release date:2021.02.18

First to talk about the Internet heard about the use of the rear brake:

1. When I came into contact with the first gear car in high school, the boss said when he handed over the car: this brake is very strong, there are two discs in front of it, you can use the back brake when you brake, but if I ride it, I will only use the brake brake, and the car never lights up the brake light, the above statement 1.

2. Contact the network in the university, see another view: when decelerating, press the rear brake and then press the front brake, and said the purpose is to wait for the center of gravity to transfer to the front wheel, the above two view.

3. Later I saw some documents about safe driving. It mentioned the front brake/rear brake ratio of 7:3, statement 3 above.

4. Also have heard heavy car friends personal experience: do not use the rear brake ah, very dangerous, step down immediately locked... , above statement four.

Believe all four of them. You've heard some of them before. Either way, it is hoped that the rider can slow down the vehicle smoothly and safely (to a stop) without locking any tires. In other words, the hope is to slow the car down within the grip of the tyres, because once you start locking the tyres, the car starts to swing and lose balance, and you have to relax the brakes to regain stability. From the point of view of the brake design of all motorcycles, the front wheel is large and the rear wheel is small, indicating that the front wheel is the main source of deceleration. The reason is that when decelerating, the weight originally borne by the rear wheels will gradually shift to the front wheels, or even finally completely transferred to the front wheels, which is the phenomenon of the rear wheels floating. So the front brakes are designed to give the front wheels a lot of deceleration force, and the rear brakes are basically in an auxiliary role.


Rear brake easy to lock the reason

1. As described above, when braking, the weight of the rear wheel will move forward more and more, so the rear tire can bear less and less braking force path, it is easy to exceed the limit and lock.

2. The rear brake is controlled by the foot, and the general knight is easy to apply too much force in an emergency, causing the rear wheel to lock up.

3. The rear brake of general vehicles is neglected in maintenance, and the condition of the disc and brake pads causes the rear brake to lock up at certain points easily.

4 for the pedal common drum brake, because the reaction force is nonlinear, but also easy to lock up due to operation.

When the deceleration is severe, the rear wheel will float, which means that the front brake will act completely, and the front wheel will bear the deceleration.

When must the rear brake be applied?

1. Double load time. Because the overall vehicle's center of gravity is shifted back so much while picking up passengers, it may not be possible to transfer all the weight load to the front wheels when braking. At this time must be operated after the brake, in order to achieve the purpose of uniform sharing, maximum deceleration.

2. Insufficient grip of the front wheel. If the front wheel grip is poor, the weight of the whole car can not be borne equally when braking, so must cooperate with the use of the rear brake, ability to reach the goal of the biggest deceleration.

In a double load, almost all of the passenger's weight is on the rear wheels, which must bear the deceleration force.

With the above concept, I believe we have a preliminary understanding of the relative role of the front brake, the back brake, next time, and then for the front of the four claims, one by one to discuss the truth behind!

Speaking of the rear brake, the instructor immediately asked everyone: "Do you use the rear brake?" "If you don't need to use it, wouldn't a cost-sensitive car company want to take it away?" From this perspective, the rear brake is indeed necessary to exist, perhaps for safety considerations, may help the rider to control the vehicle, but in any case, we must identify the existence of the rear brake and the use of the necessity. Then there is the question of when to apply the rear brakes to help the ride. And how to operate the rear brake?

When should you apply the rear brake to help riding?

According to the author's observation, the Japanese instructors in the operation of continuous winding cone, near the corner cone brake lights will be on. It is speculated that the instructor continues to reduce the speed by using the rear brake to make the radius of rotation smaller. The other part is to maintain the sense of stability of the vehicle by relying on the drag force of the rear brake. Furthermore, having the rear brake on when starting to reload the throttle can also reduce the sudden power output, so as not to cause the rear wheels to suddenly skid.

When discussing the wheel, the instructor talked about the deceleration action at the bottom of the straight line: when entering the brake point and starting to decelerate, the former brake was mainly used to decelerate, while the current brake was gradually released, and when starting to tip into the corner, the rear brake was used to help the vehicle tip into the corner. The idea is the same as above, when it is hoped that the rear brakes will help the car into the corner and maintain a sense of calm.

How do you operate the rear brake?

A lot of people are told not to use the rear brake because it's easy to lock up, but the instructor tells us bluntly that it's a matter of riding, both the driver and the road rider have to train themselves and figure out how to apply the right amount of force. Otherwise to the road driving, in case the front brake failure, must rely on the rear brake to slow down, then never used after the brake of the rider's fate is not difficult to imagine.