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Your Position: HOME > Company > I just changed the brake pads; what should I do?
CompanyCompanyWhen I stepped on the brakes, I heard the sound of "buzz~", which was very harsh. It's like scratching the blackboard with fingernails; it's uncomfortable.
Some friends feel uncomfortable, but they are afraid and worry about whether there will be any problems with the brakes: Will the brakes become weak when I drive?
If there is just a simple abnormal noise, the braking force is sufficient when you step on it, and can still be braked the car stably, and there are generally few significant problems.
However, it is more troublesome to solve the abnormal brake noise. There are many kinds of situations. Today, I will try to explain it to my friends once.
The abnormal noise disappears after a period, which is a normal phenomenon
It rains in summer, and the strange sound caused by the rusted brake disc
More often, the car has been parked for some time, and there will be strange noises when starting, which is caused by the rust of the brake disc.
It often rains in summer, and the brake disc will rust after one night of parking. One night is enough. Because most of the brake discs of family cars are cast iron, rusting is also very typical. Open it for a while, and it's OK to grind it clean.
That's what the master said when he repaired the car. Don't think he's cheating on us or unprofessional; that's the case.
If you stop for a long time, you need to pay attention.
Brembo's official website states: Long periods of non-driving may cause the brakes to stick. If you start with the brakes and walk a little forward and back, you can prevent rust from accumulating.
In this operation, it is recommended to do it once a week.
Just stop for a moment when you drive forward, stop for a moment when you go back a little bit, back and forth, back and forth several times.
Occasionally appear but disappear after a while
It is not rusted if you have seen it before getting in the car. There is still a bit of abnormal noise when starting, but it seems to disappear after a while. It may be small stones or sediment.
It is often the case after driving on a bad road or in heavy rain. Suddenly it started to make abnormal noises, and when I stepped on 2 feet, it didn't seem to be there.
Generally speaking, sand and small stones can fall away quickly without damage to the brake disc.
If there is always abnormal noise and a trace on the brake disc, it should be dealt with in time. It may be that a relatively large stone has entered, and it cannot fall off, so let the master help to take it out.
If it keeps ringing, you need to take the correct medicine
Excluding the possibility of sand entering, the abnormal noise is still there. We need to take the proper treatment according to the situation.
It may be that the brake pads and brake discs are not worn well.
The first situation is that the friend who just changed the brake pads has been making abnormal noises. It may be the brake pads and brake discs; these two buddies have not run well.
It's the same as at work: a new colleague, right? You like to drink black tea or milk tea; he likes to drink green tea or milk tea. He wants to add coconut; you want to add pearls.
It is convenient to take out after getting familiar with it, and the brakes are the same.
Responsible masters will usually give us a polish when they are installed. We can do it ourselves if we don't know if the master has polished it. How to do this thing?
Britain's Ferodo brakes say this: brake from a speed of 30mi/h, or decelerate from 50mi to 20mi and do 20 times.
Converting to kilometres is about 50yd speed or 80 braking to 30. This way, the running-in is relatively fast.
Safety first, doing it on a closed road or a venue where this is allowed is recommended. Usually, driving in the urban area, don't come here suddenly and be rear-ended; it is very troublesome.
It is better to open it normally. If it is opened typically, how long will it take to break in? Or refer to the information on Brembo's official website: After replacing the brake pads, it takes a running-in period of about 300km, so be patient.
During this period, try not to press the brake to the end with a "click"; use it usually or relatively softly.
It must be the first goal to brake, and also to brake, you can brake more normally and brake with one foot into the car, and everyone will shake, right? Bouncing should be avoided as much as possible.
Frequent braking, abnormal noise caused by high-temperature oxidation
If it doesn't make a sound just after the replacement but starts to sound after some time, it is usually caused by the oxidation and hardening of the brake pad's surface.
Zhu Chunchuan published a paper in the journal "Southern Agricultural Machinery", "The Main Reasons and Solutions for Abnormal Noise of Automobile Brakes", which said so.
During the continuous braking process of the car, high temperatures will be generated, which will cause the surface to oxidize and form hard spots. The friction between the hard places and the brake disc will cause noise when braking.
After using it for a long time, more parts on the surface are oxidized and hardened, and abnormal noises will appear.
Some repair shops will directly ask us to replace the brake pad with a new one, saying: "Your brake pad is not good, you can see it is called, it is good to replace it, but it is not good."
At this time, you should pay attention to avoid being pitted because as long as there is a margin, you can grind off the hard spots by scratching the surface of the brake pads.
How do we know the margin? Refer to the requirements of the maintenance manuals on the official websites of different manufacturers. Generally, brake pads with a thickness of more than 4mm can continue to be used.
And inside the brake pads, there is also a point, which can be seen with the naked eye. Specifically, ask the master to show you when you are in the repair shop, and you can understand.
Master who can't explain this clearly, don't let him repair.
I went to the 4S store and said it was a common problem and could not be solved
During the warranty period, you can always find it for free replacement
The last thing to add is whether the abnormal brake noise can go through the warranty. If the car is still in the warranty period, you can go to the 4S shop to ask for a solution to the abnormal noise.
Article 19 of "Regulations on Responsibility for Repair, Replacement and Return of Home Auto Products": Consumers can choose to repair for free if there are quality problems during the warranty period, including wearing parts.
Even if someone from the 4S shop told us: "The abnormal brake noise is a common problem. This brand is like this in the whole family. Your car, this part, is the wearing part."
So what? You have to help me. "Hey, don't do it; it will still ring after a while, right?"
And theoretically speaking, as long as there is abnormal noise during the warranty period, we can always find a 4S shop to solve it.
But be careful; if we do this, try not to go outside to repair a brake system or modify it; again and again, it will be easy to argue.
The most used brake pads on the market are semi-metal friction materials with low production costs and good performance. The disadvantage is that it is easy to cause noise.
Experiments have proved that brake pads made of low metal materials have lower noise, higher strength and more wear resistance.
When buying, look at the details, which generally indicate low metal. If it doesn't work, you can ask the seller.
It is usual for abnormal noise during a cold start and running-in period
So, in general, there are some strange noises at the beginning of a cold car or when the brake pads are just changed, and the brake pads are running in; they are all everyday phenomena and can be ignored.
If it keeps ringing, in addition to considering whether the brake pads are polished, it is also necessary to see if there is any abnormal wear, such as a stone falling in.
The brake pads of some cars have been used for a long time, and they will sound. It is a common problem. It is the case in the whole family. We can go to the 4S shop to solve it.
It's tough to accept; you can change it, but don't change the same. Try replacing the brake pads with low metal content, which usually works wonders.
How can you check whether the brake pads need to be replaced without removing the tires?
I just said a bunch of truths and gave some figures for your reference.
Generally speaking, the brake pads need to be replaced every 30,000 to 40,000 km. The brake disc, the round and visible part, is more extended, 70,000 to 100,000 km.
It is a reference; different strengths, vehicle conditions, and consumption are entirely different.
The maintenance master said to change it; we just changed it, right? So what should we do if we are worried? Can we usually check it at home?
In addition to brake pads, discs, and fluid, don't you also need to maintain it? Do you want to replace one piece? How often do you get the brake fluid?
The shop asked me to change the brake fluid at 20,000 km and asked me to change the brake pads at 40,000 km. Shouldn't it be all 40,000 km? Is it all about making money?