Category: Auto

How To Independently Assess The Wear Of Brake Pads And Discs?

2023

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Video: How To Independently Assess The Wear Of Brake Pads And Discs?

Отличия серверных жестких дисков от десктопных
Video: How to check & measure your brake rotors / discs 2023, January
How To Independently Assess The Wear Of Brake Pads And Discs?
How To Independently Assess The Wear Of Brake Pads And Discs?
Anonim
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In most cars, during normal operation, the inner shoe erases a little faster than the outer one, and this does not depend on the design of the brake mechanisms. However, under specific operating conditions or due to the design features of some machines, the inner pads sometimes wear out noticeably more intensively than the outer ones. For example, on Mazda 6 of the second generation, the inner block on the front right wheel erases one and a half times faster than the outer one.

Конструкция тормозов у Лады Калины такова, что без снятого колеса вообще бесполезно вглядываться в передние тормозные механизмы - состояние колодок оценить не удастся
Конструкция тормозов у Лады Калины такова, что без снятого колеса вообще бесполезно вглядываться в передние тормозные механизмы - состояние колодок оценить не удастся

The design of the brakes at Lada Kalina is such that without a removed wheel it is generally useless to peer into the front brakes - the condition of the pads cannot be estimated. The design of the brakes at Lada Kalina is such that without a removed wheel it is generally useless to peer into the front brakes - the condition of the pads cannot be estimated.

In addition to structural nuances, malfunctions can also occur. For example, increased pad wear due to a sour piston. Therefore, during the first inspection of the brake mechanisms on a machine that you have not yet had to deal with, it is important to remove the wheel in order to assess the condition of both the external and internal pads. Unscrupulous servicemen are often limited to an approximate assessment of the wear of only the outer pads, looking at them through the spokes of the rim without removing the wheel itself. It is possible that soon the dissatisfied customer will return to this service station with erased internal pads and complaints!

As an example, we check the condition of the brakes on the editorial Kalina, which has traveled almost 63, 000 km. In addition, we give approximate indicators of the critical wear of various elements of the brake system. For each specific car model, they can differ both in the larger and smaller directions. These data can be found in books on repair and maintenance or on the Internet.

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What you need to know when replacing the brake pads of a car: expert advice “Behind the wheel” On Kalina, you cannot really determine the wear of even the external brake pads if the wheel is not removed. The distance between the spokes of the alloy wheel is decent, but the bracket severely limits the view. But, for example, on Mazda 3 of the first two generations, the wear of the outer pads is clearly visible with the wheel on. True, to inspect the inner pads it still has to be removed.

But back to our Kalina. Only after removing the wheel is the real picture visible. The thickness of the friction lining is approximately equal to the thickness of the base of the pad: wear is about 60%. If the thickness of the friction lining is reduced to 2 mm, this will mean 100% wear. Many cars have a metal tongue at the base of the block. During critical wear of the lining, it begins to contact the brake disc, emitting a characteristic creak. Most often, the tongue is installed only on the inner pads.

Со снятым колесом без разбора тормозного механизма хорошо видно, что износ передних колодок на нашей Калине составляет примерно 60%
Со снятым колесом без разбора тормозного механизма хорошо видно, что износ передних колодок на нашей Калине составляет примерно 60%

With the wheel removed indiscriminately, the brake mechanism clearly shows that the wear on the front pads on our Kalina is approximately 60%. With the wheel removed indiscriminately, the brake mechanism clearly shows that the wear on the front pads on our Kalina is approximately 60%.

Why can pad wear accelerate?

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We select brakes for Lada Kalina 2: stop on demand

It is important to remember about difficult operating conditions, for example, driving on mountain streamers or participating in amateur races. In such modes, in a working brake system, the inner shoe may begin to grind many times faster than the outer one. Something similar happened once with my car. With everyday driving, pad wear on the latest generation Volkswagen Jetta sedan was uniform. This lulled my vigilance, and I stopped monitoring the state of the inner linings. After participating in two stages of sprints (far from the most difficult for technology), it turned out that the inner pads were almost completely obliterated. This was especially evident on the left wheel. It’s fortunate that it didn’t come to a scuff on the brake discs!

Also do not forget that if, for example, you traveled 30, 000 km and the wear of the front pads was about 50%, this does not mean that they will last up to 60, 000 km. The smaller the thickness of the patch, the faster its further wear occurs. After all, the less “greasy” brake pad perceives the same portions of thermal energy from friction.

Brake disc wear

Brake disc wear is more stable and predictable. Most often, there are enough disks for two sets of pads. A reduction in disc thickness of approximately 2 mm means 100% wear. Over time, a chamfer forms on the edge of the brake disc due to a chamfer.

Ступенька от выработки переднего тормозного диска нашей Калины уже хорошо ощутима при прикосновении, но такой диск еще походит
Ступенька от выработки переднего тормозного диска нашей Калины уже хорошо ощутима при прикосновении, но такой диск еще походит

The step from the development of the front brake disc of our Kalina is already palpable when touched, but such a disk still resembles. The step from the development of the front brake disc of our Kalina is already palpable when touched, but such a disk still resembles.

The design of many rims allows you to stick your hand between the spokes and touch to determine the production of the brake disc. The main thing is not to do this while the brake disc is still hot, immediately after a trip with intense braking. This technique will be useful to those who plan to purchase a used car. From the wear of the disk, we can draw conclusions about the actual mileage of the car or about the conditions in which it had to drive. But the best thing is to remove the wheel and carefully inspect the brake mechanism, including the inside of the disc. It happens that there, due to corrosion, grooves and a wavy surface are formed.

До предельно допустимого износа тормозного диска нашей Калины осталось 0, 7 мм. В большинстве случаев этого хватит, чтобы отъездить на еще одном комплекте колодок
До предельно допустимого износа тормозного диска нашей Калины осталось 0, 7 мм. В большинстве случаев этого хватит, чтобы отъездить на еще одном комплекте колодок

Before the maximum allowable wear of the brake disc of our Kalina, 0.7 mm is left. In most cases, this is enough to go on another set of pads. Before the maximum allowable wear of the brake disc of our Kalina, 0.7 mm is left. In most cases, this is enough to go on another set of pads.

When to change brake discs and pads?

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DO YOU KNOW … why the brakes creak?

If the wear of the disks is already critical, and the pads are almost new, then do not rush to immediately change the entire set of consumables, especially if you operate the car not in difficult technical conditions. The work of replacing disks can be postponed for a while. But do not completely turn a blind eye to the problem. Remember that as the disc thickness decreases, braking performance is reduced. After all, too thin a disk will dissipate thermal energy, which in addition will become faster and overheat. In particularly advanced cases, due to excessive wear on the brake disc, the shoe may even fall out of the mechanism!

With the wear of the rear disk mechanisms, the situation is similar, with only one correction: they are less loaded, and therefore wear is slower. This has its pros and cons. The rear brake discs and pads have a longer resource than the front ones (about one and a half to two times), but also suffer more from corrosion. Therefore, it is on the rear brakes that it is important to check the inner surfaces of the discs! Our Kalina has rear drum-type brakes.

How to evaluate drum brake wear?

Most machines from the side of the drum casing have a viewing window for evaluating the thickness of the pads. However, most often it can be used only if the machine is hung on a lift or is standing on a viewing hole. Otherwise, seeing through this window is extremely difficult.

На левом фото показано расположение смотрового окна относительно барабанной колодки. Пользоваться им, имея в распоряжении лишь домкрат, не очень-то удобно
На левом фото показано расположение смотрового окна относительно барабанной колодки. Пользоваться им, имея в распоряжении лишь домкрат, не очень-то удобно

The left photo shows the location of the viewing window relative to the drum pad. Using it, having only a jack at its disposal, is not very convenient. The left photo shows the location of the viewing window relative to the drum pad. Using it, having only a jack at its disposal, is not very convenient.

To remove the drums is sometimes also very problematic. For example, cars of French brands will have to unscrew the hub nut. In the case of Kalina, everything is simple, the drums are removed without any problems.

Оценить износ элементов барабанных тормозных механизмов на Калине можно сняв кожух барабана
Оценить износ элементов барабанных тормозных механизмов на Калине можно сняв кожух барабана

To assess the wear of the elements of drum brake mechanisms on Kalina, you can remove the drum casing. To assess the wear of the elements of drum brake mechanisms on Kalina, you can remove the drum casing.

Usually, the wear of the drums is estimated by the inner diameter: an increase of 1 mm means a sentence.

What is the difference between drum brakes and disc brakes?

One of the drawbacks of drum mechanisms compared to disk ones is the lack of a self-cleaning effect. Wear products from brake pads remain inside the drum and leave characteristic marks on the working surfaces of the friction elements.

Из-за обилия продуктов износа на рабочей поверхности колодки образовались характерные борозды. Фактический износ накладок составил порядка 30%
Из-за обилия продуктов износа на рабочей поверхности колодки образовались характерные борозды. Фактический износ накладок составил порядка 30%

Due to the abundance of wear products, characteristic grooves formed on the working surface of the block. The actual wear of the linings amounted to about 30%. Due to the abundance of wear products, characteristic grooves formed on the working surface of the block. The actual wear of the linings amounted to about 30%.

Editorial Kalina is often used to participate in various competitions. That is, the conditions of its operation can be called difficult. However, to our surprise, the wear of the original pads turned out to be small - about 30%. Perhaps the reason is that the car has a relatively small mass, and dynamic performance is not outstanding.

Глубокие борозды на рабочей поверхности барабанов - результат воздействия на них продуктов износа
Глубокие борозды на рабочей поверхности барабанов - результат воздействия на них продуктов износа

Deep furrows on the working surface of the drums are the result of exposure to wear products. Deep furrows on the working surface of the drums are the result of exposure to wear products.

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