Audi brakes only after changing the brake pads and pressing to the end

First of all, the brake should be high after replacing the brake pads, if the brake is not only not high, but it only works when pressed to the end, it is the problem of the brake master cylinder, and the plunger of the brake master cylinder should be sticky. In this case, it is recommended to replace it together with the brake oil, because after changing the brake pads, the brake master cylinder can not suck the brake oil in the brake oil cup into the brake master cylinder, so when the brake is lifted, the oil in the brake cylinder flows back to the brake master cylinder, forming a gap between the brake disc and the brake pad is too large, so when the brake is stepped on, the brake oil in the brake master cylinder is filling the brake cylinder, filling to the contact between the brake disc and the plate, so the brake is particularly low. Therefore, it is necessary to change the brake oil, one is to ensure the cleanliness of the oil, and the other is to fully clean the brake master cylinder so that the plunger can work more normally.

When the brake pad is properly returned when the brake is started, the brake oil in the brake oil cup of the component should be inhaled at the same time, so as to make full preparations for the next brake, and adjust the gap between the brake pad and the disc.

Usually, the brake effect of the newly replaced brake pads is worse than that of the original car. You may have a softer situation, this is normal, you need to run in for a period of time, the new brake pads and brake discs have not been completely fitted, generally run for about two or three days can return to normal.

That should be the replacement of the brake pads, if there is a problem, you can find an installation shop for debugging or deflation to solve.

It should still be that the brakes are not adjusted properly.

1.Audi replaces the brake pads every 80,000 kilometers. The brake pads are composed of steel plates, bonded thermal insulation layers and friction blocks, of which the thermal insulation layer is insulated by non-thermal conductive materials; The friction block is composed of friction material and adhesive, which is squeezed on the brake judgment disc or brake drum during braking to produce friction force, so as to achieve the purpose of vehicle deceleration and braking.

Brake pads, also known as brake pads, are key safety components in the automotive braking system.

2.In terms of power, the Audi A8 is equipped with a turbocharged engine and an 8-speed automatic manual transmission, with a maximum power of 210kW and a maximum torque of 450Nm.

3.In terms of suspension, the front and rear suspension of this car adopts a multi-link independent suspension.

Summary. Hello, thank you for your patience, you have asked the question, the problem that is easy to occur is that the brake fluid will be compressed, the reason is that no matter what kind of brake oil, it has a certain hydrophilicity, in other words, the brake fluid will gradually enter the water with the use of time. When the moisture in the brake fluid increases, the heat generated by the friction between the brake pad and the brake disc will be transferred to the brake fluid through the brake cylinder, and the moisture in the brake fluid will be vaporized because of the heat.

This situation is called the phenomenon of brake fluid vapor resistance, which is a common problem of hydraulic braking systems, and similar problems will almost occur after a period of use.

Hello, thank you for your patience, you have asked the question, the problem that is easy to occur is that the brake fluid will be compressed, the reason is that no matter what kind of brake oil, it has a certain hydrophilicity, in other words, the brake fluid will gradually enter the water with the use of time. When the moisture in the brake fluid increases, the heat generated by the friction between the brake pad and the brake disc will be transferred to the brake fluid through the brake cylinder, and the moisture in the brake fluid will be vaporized because of the heat slag, so naturally, the moisture in the brake fluid will become compressible after vaporization, resulting in a soft pedal, longer stroke, and an increase in the braking distance. This situation is called the phenomenon of brake fluid vapor resistance, which is a common problem of hydraulic brake system, and almost all of them will have a similar cover key problem after a period of use.

1. The metal particles in the brake pad composition are too large: the brake pad and the brake disc are rubbing, and the metal particles rub against the abnormal sound of the brake disc, you can remove the brake pad and polish the brake pad to solve the abnormal noise. 2. Abnormal noise caused by uneven contact surface between brake pad and brake disc:

Generally, this fault phenomenon occurs after replacing the brake pads, because the contact surface of the new wide shirt brake pads and the old brake disc is not rotten and flat, and the two are not completely in contact when the vehicle brakes.

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After the new car brake pads should be stepped on hard: the brake pads usually need the driver to step hard, which is actually a normal phenomenon, mainly because the new brake pads and the old brake disc need a period of running-in, and the brakes will generally be stepped on very low during this period of running-in, and the braking effect of the car will become better after the running-in period. The brake pads of the car need to be replaced when the vehicle travels about 30,000 kilometers, because the long-term use of the brake pads of the car will lead to the wear of the brake pads, if not replaced in time, it will lead to the phenomenon of difficult and weak braking in the car, and at the same time, there may be brake shaking or abnormal noise in the process of braking.

What's the matter with pressing hard after changing the brake pads of the new car.

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After the new car brake pads to step on the same thing: the replacement of the brake pads usually need the driver to step hard, this is actually a normal phenomenon, mainly because the new brake pads and the old brake disc need a period of running-in, in the run-in of this period of rough brakes will generally be very low, and after the run-in period, the brake effect of the car will become better. The brake pads of the car need to be replaced when the vehicle travels about 30,000 kilometers, because the long-term use of the brake pads of the car will lead to the wear of the brake pads, if not replaced in time, it will lead to the phenomenon of difficult and weak braking in the car, and at the same time, there may be brake shaking or abnormal noise in the process of braking.

Extended information: Braking, also known as braking, refers to the action of stopping or slowing down a running locomotive, rolling stock, or other means of transportation or machinery. The general principle of braking is to fix a wheel or disc on the high-speed shaft of the machine, install the corresponding brake shoe, belt or disc on the machine base, and make it produce braking torque under the action of external local leakage force.

The brake device is a mechanical braking device that can slow down the speed of the vehicle, also known as a reducer. To put it simply: the car brake pedal is under the steering wheel, and when the brake pedal is pressed, the brake lever is pressurized and transmitted to the brake pad on the brake drum to jam the brake wheel, so that the car slows down or stops running.

The manual brake of the car is next to the gear shift and is connected to the brake bar. Bicycle brakes are also common, which are decelerated by rod-shaped Tongling actuators or disc brakes fixed on the frame.

Audi brake pads need to be replaced when they travel more than 80,000 kilometers. Under normal driving conditions, every 5000 kilometers of braking shoes should be checked, and the state of wear and tear of the shoes should be checked, whether the degree of wear on both sides is the same, whether the return position is free, etc., and the abnormal situation must be dealt with immediately.

Brake pads will produce instantaneous high temperature during braking, especially when driving at high speed or emergency braking, the friction coefficient of the friction pads will decrease at high temperatures. When purchasing Audi brake pads, look at the friction coefficient, the friction coefficient determines the basic braking torque of the brake pads, too high will cause the wheels in the braking process to lock, lose control of the direction and burn the pads, too low will be too long braking distance; Second, we need to look at security.

When replacing Audi brake pads, the brake pads provided by the original spare parts should be replaced, and only in this way can the braking effect between the brake pads and the brake disc be the best and wear the least. We pushed the brake piston to the innermost level, and it was empty when we first applied the brakes. In the process of changing brake pads, it is good to step on it a few times in a row.

Brake disc replacement cycle: Generally, the brake disc needs to be replaced after 3-40,000 kilometers, and the brake disc needs to be replaced after 70,000 kilometers. The use time of the brake disc is relatively short, and the brake disc of the car is usually replaced after two replacements, and the rear brake is replaced after 8-100,000 kilometers.

How can you tell if the brake disc needs to be replaced? 1.Observe the brake disc warning light to judge the grip

Under normal circumstances, the brake disc indicator light is off. When the brake disc is faulty or excessively worn, the light turns on and turns off after repair. When the warning light is on, the brake disc has been worn to the limit, and the braking effect is reduced, which greatly affects driving safety.

Therefore, we recommend regularly checking the wear and tear of the brake disc to see if it can be used, and not just trust the warning lights. 2.Check the thickness of the brake disc:

Most brake disc products have a wear index, that is, there are three small dimples distributed on the disc surface. The depth of the pit measured by the vernier caliper is, that is, the total wear depth on both sides of the brake disc is 3mm, and it is recommended to replace the brake disc in time. 3.

Listen to the sound: If the slight brake is accompanied by an "iron rubbing" or squeaking sound (which may also be the effect of the brake pads running in at the beginning of installation), the brake pads must be replaced immediately. Because the limit marks on both sides of the brake pads have been rubbed directly against the brake disc, it proves that the brake pads have exceeded the limit.

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Brake pads are not fixed how often to change the statement, it depends on the driving road conditions and driving habits, these habits will affect the use of brake pads, if you can grasp it well, you will find that many times there is no need to step on the brakes, a pair of brake pads are used well, can reach 100,000 kilometers.

So, when you need to replace the brake pads, you can check them regularly through the following items, and if you meet the conditions, you have to replace them immediately.

1. Check the thickness of the brake pads.

Check whether the brake pads are thin, you can use a small flashlight to observe and check, when the inspection finds that the black friction material of the brake pads is almost worn out, and the thickness is less than 5 mm, you should consider replacing it.

2. The sound of brakes.

If in the process of daily driving, the brake hears a harsh metal whistling sound, at this time you should pay attention, this is the alarm iron plate on the brake pad has begun to wear out the brake disc, so there will be this kind of sharp metal sound.

3. Braking strength.

When driving on the road and stepping on the brakes, if you feel very hard, there is always a soft feeling, often need to step on the brakes deeper to achieve the previous braking effect, when taking emergency braking, you will obviously feel that the pedal position is low, then it may be that the brake pads have basically lost friction, at this time must be replaced, otherwise it will cause serious accidents.

In addition, the reduction of braking effect will lead to an increase in brake fluid consumption, so it is important to check the condition of brake fluid when replacing brake pads.

If the brake pad has an induction line, a red word "Please check the brake pad" will appear in the alarm. Then there is an icon, which is a circle, surrounded by several dotted brackets, when the warning light is lit up, it is quite dangerous, because this warning system has a direct sense of the thickness of the brake pads, and some are in the brake pads have been completely worn out, and the brake fluid is therefore extremely reduced, so that the warning lights will be lit.

It is related to your car habits, there is no fixed, and people who drive smoothly can travel tens of thousands of kilometers without changing.

When should I change, no need to bend down to see, high-end cars generally have sensors, once the warning value is exceeded, the driving computer will alarm. Ordinary cars come with "sound alarm": once the brake pads are worn to the limit, the warning iron on the side will rub against the brake disc, emitting a heavy metal sound ......This feature is also quite high-end.

As long as you call the police, you should go to the repair shop as soon as possible to check and replace the parts. At this point, the braking force is only slightly reduced, but it can damage the brake discs. Generally speaking, the life of the brake disc is much longer, and it is not a dream to use 100,000 kilometers for private cars in urban areas, as long as there is no abnormal noise or shaking when braking.

The surface of the normal brake disc has a uniform and smooth imprint, and sometimes there will be a large area of rust on the brake disc after rain, which is also a normal phenomenon.

Audi's brake pads are relatively wear-resistant, and under normal circumstances, there is no problem in changing them for 40,000 to 60,000 kilometers.

The brake pads need to be replaced if there are still three millimeters of thickness, which has little to do with the number of kilometers.

Because the frequency, time, and intensity of each braking are not the same, so you can't judge whether to replace the brake pads by mileage or time, in order to solve this problem, the factory will have an alarm metal sheet outside the extreme wear layer when manufacturing the brake pad, and when it is worn to the metal sheet, it will make a sharp squeak to remind you that you should replace the brake pad.

The brake pads will wear out faster than the cars on the highway. Because the car that often drives in the city often has to stop and go, and the brakes will be used a lot. It may take dozens of kilometers to slow down or stop when taking the road, and there are relatively few opportunities to use the brakes.

4. Cars with large load capacity have large brake pad loss. In the case of deceleration and braking at the same speed, the inertia of the heavy car is large, and the force of brake pad friction is large, so the wear is large.

Generally, a red word will appear in the alarm "Please check the brake pads". Then there's an icon, which is a circle, surrounded by a few dotted brackets. Generally, when it comes out, it means that it is close to the limit and needs to be replaced immediately.