What happens to the brake discs at high temperatures?

What happens to the brake discs at high temperatures?

Kaidon Brake , 2020 Jan 8th

Learn how the performance indicators of materials will change at high temperatures today:

The mechanical properties of the material are greatly affected by temperature. As the temperature increases, the strength, stiffness, and hardness decrease, and the plasticity increases. At the same time, at higher temperatures, the duration of the load also affects the mechanical properties, which can cause significant creep. Frequent braking produces friction, which will cause the brake pads to heat up. At this time, the brake pads' strength, stiffness, and hardness decrease, and plasticity increases. At higher temperatures, we brake the brake pads under constant stress, even if the stress is less than the yield point at this temperature, the material will slowly plastically deform. Once the material has crept, it will eventually cause the material to break.

 

 

The mechanical properties of metal materials at normal temperatures are compared with the mechanical properties at high temperatures. Under normal temperature, the material will plastically deform only when the stress exceeds the yield point. For example, Q235, as a common grade of carbon structural steel, has the following mechanical properties:

Yield strength: The lowest stress value at which a material begins to undergo significant plastic deformation. Tensile strength: the maximum stress value the material is subjected to before breaking. At normal temperature, if the stress value is less than the yield strength, the material deformation will disappear after the force is removed. For precision mechanical parts, even a small amount of plastic deformation will cause the precision of the parts to decline and cause failure.

 

 

Friction coefficient changes with temperature

At high temperatures, the friction coefficient of the brake pads decreases, resulting in the weakening of the braking force. I personally think that the root cause of the decrease in friction coefficient is the performance of the brake pads at high temperatures, such as creep, and the decrease in strength, stiffness, and hardness. It softened and therefore affected the brakes. Perhaps we have overlooked a problem: In the entire braking system, the brake parts that are most affected when they are overheated are not the brake pads, but the brake fluid in the brake hydraulic system.

Anyone who has maintained the brake system in the racing department knows that every time the brake system overheats, it is necessary to replace a part of the brake fluid, because the brake fluid decomposes during contact with high temperatures, generating bubbles, and gathering near the brake piston. In addition, the brake fluid itself absorbs water. In addition to absorbing water, the brake system will rust, and moisture will also generate bubbles when the temperature is relatively high.

 

When the brake is stepped on at high temperature, I feel a sponge, mainly because the air bubbles in the hydraulic system are compressed. The hydraulic pressure cannot be transmitted to the piston to compress the brake pads. Finally, it is caused by pressing the brake disc. It has nothing to do with the deformation of the brake disc, because the brakes The deformation of the disc is micron level, and the soft feel of the brakes caused by air bubbles is centimeter level.

 

There is a term called bleeding in the term of maintenance of brake fluid, which is to release the deteriorated brake fluid and bring out air bubbles without letting air enter the hydraulic system.

 

If the temperature of the brake pads is too high, the material of the brake disc will be weakened, and the braking effect will be greatly reduced, or even malfunction. brake.

It should be noted that, for example, downhill roads, long-term downhill roads will frequently use the brakes, which will cause the brakes to overheat. At this time, pay attention to stopping to let the brake discs cool and then continue to open, otherwise, it will be very dangerous to wait for the braking effect to decline or malfunction.

 

 

For example, in racing, because of the fast speed and the frequent use of brakes in the corners, the brake discs are made of high-performance materials, and often when the brake discs have heat dissipation problems, the brake discs will burn red when stopped.

 

 


The replacement of the brake pads is the same as the replacement of the oil and the three filters. As a regular item, it is understood by the majority of owners, but many owners do not know when the brake pads and brake discs need to be replaced together.

Should the brake pads and brake discs be replaced together?

Click the link to know more: https://bit.ly/39zwaLP


Some drivers may feel during the driving process that sometimes the brakes of the vehicle suddenly become very soft, and the braking force will be feedbacked after pressing the brake pedal for a period of time, which may cause a traffic accident in an emergency. So, what exactly causes the vehicle's brakes to be soft?

why brake pedal feels soft and spongy?

Click the link below to learn more: https://bit.ly/2ZUoMGh


Why the braking system makes noise?

Although the factors that affect the braking noise are more complicated, through years of experimental verification and experience accumulation, previous people have concluded that the occurrence of braking noise generally has the following rules: https://bit.ly/2uidfF1


What should we do if the car in front suddenly breaks? 3 ways to save your life.

As we all know, Cars drive faster on the highway, and cars are full of dangers at high speeds. So, what would you do if you suddenly came to a sudden brake on high speed?

Click the link below to learn more: https://bit.ly/2Fi3aKq


Vehicles on the road are prone to nagging. It is very important to follow the traffic rules, but it is necessary to pay more attention to the self-learning experience. "Don't say how old you are and how much experience you have. Most traffic accidents happen this way. You can avoid this accident if you handle it properly.

90% of car accidents happen this way

Click the link to learn more: https://bit.ly/2QmUPfb


why does the brake need to be maintained every 20,000 kilometers?

Brake maintenance is recommended every 20,000 kilometers, caring for the brakes, so that safety is always with you!

Click the link to learn more: https://bit.ly/2sZg8tF


how should the newly changed brake pads and brake discs run in?

As we all know, the brake pads and brake discs will wear out after a period of use. When the wear reaches the limit, they need to be replaced. After replacing the new brake pads and brake discs, running-in is a crucial process, which not only affects the safety of driving but also affects the comfort of braking.

Click the link to learn more: https://bit.ly/2s7tMLv



Braking is not only a test of people's driving skills in an emergency, but it is also important to brake normally. We will see that some people use the brakes in a timely and smooth manner when using the brakes, while some people will brake suddenly and sharply, and the driving experience will be more than a little different.

Why is it dangerous to brake immediately in an emergency? 8 braking tips to improve your driving ability!

Click the link below to learn more: https://bit.ly/2Nptk2E

 


Many friends think that such things as "braking failure" cannot happen to themselves, so they don't understand how to deal with "braking failure". Everyone pay attention, life can be saved at critical moments!

What to do if the brakes fail?

Click the link below to learn more: https://bit.ly/2RaWKCy

 


Old drivers often say that the road feel comes mainly from the steering wheel, which stems from the working principle of the steering wheel. Can the steering wheel act like a stethoscope and let us know how the other parts of the car work? The answer is yes.

How to see the malfunction of the car through the steering wheel?

Click the link below to learn more: https://bit.ly/2QNuoiR


 


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