Brake system is one of the most important.components of any car. Its main elements are the disc and pads. Braking is based on the force of friction. The pads are in contact with the disc, resulting in torque resistance. The machine starts to slow down. However, over time, the friction material wears out and the pad requires replacement.
It is not only important to properly install these.details, but also in time to diagnose wear. This helps the motorist brake pad wear sensor. The principle of operation, the device types - later in our article.
Based on the name, it becomes clear thatThe main function of this element is to determine the degree of wear of the friction material. A special lamp is displayed on the instrument panel. When the thickness of the pads approaches the minimum, the contacts close. The driver sees the corresponding signal on the instrument panel.
At the moment there are several types of sensors:
They can be installed both on one and on several axes of the car. To find out their essence of work, consider each type separately.
It's pretty simple, but effective.tool for tracking the wear of the friction lining. Such a brake pad wear sensor has a simple device and consists of a plate of a certain shape. It is installed on the base of the pad. How does this item work? The principle of operation is as follows. The sensor plate is installed so that its ends protrude beyond the pad. When the friction material is erased to the minimum value, this protruding end will come into contact with the disk. The result will be a characteristic creak. On it and determine the wear.
This is more modern and technological.instruments. They interact with the lamp on the instrument panel. The driver no longer has to listen to his car. All the necessary information is on the panel.
In turn, the electronic brake pad wear sensor is further divided into two subspecies:
The first type is mounted on the metal part.pads. Sideways there is a special notch. The main advantage is that when replacing the pads, the sensor does not need to be changed. It can be rearranged to the new brake element. Integrated devices are placed inside the friction lining. Extract them is not possible. They are changing in the collection with new brake pads. It should be noted that these elements are easier to replace.
The electronic sensor consists of a metalliccore, which is placed in a plastic case. In order to eliminate the risk of damage to the brake disc (since the core will contact it when you press appropriate pedal), the rod is made of soft steel grades.
This element may fail by severalreasons. The most common is damage or breakage of the power wires. In this case, the lamp will not light up even when the pad is 99 percent worn. The second reason is the oxidation of contacts. This often happens at the junction of the sensor and the plug, near the caliper. During operation, the sensor can get water and dirt. All this affects the resistance of the circuit. As a result, the red lamp can light up even with new brake pads.
Replacing the brake pad wear sensor maybe produced by yourself. To do this, poddomkratit necessary part of the car and unscrew the wheel. The external sensor will be located near the hub (we will not change the integrated one). The element is mounted on a spring or with the help of clamps. Carefully remove the mounting mechanism and take out the brake pad wear sensor itself. Next, you need to thoroughly clean the seat of dirt and sediment. The sensor pins themselves are also processed. In place of the old set the new element and fasten the wheel back. We lower the car from the jack. We check the performance of the new element. If the pads are worn, the lamp should be lit. In some cases, to resume the correct operation of the sensor, it is enough to simply clean the contacts.
Many are wondering whatperiod of time to change pads. Even the manufacturer will not give an exact answer to it, since everything depends on the style of riding. Practice shows that with moderate use, the front pads "walk" up to 40 thousand kilometers.
So, we figured out how the wear sensor works.brake pads. As you can see, this is a very useful device that automatically signals the need to replace the friction linings. Such an element can often be seen on cars "Mercedes" and "BMW". If desired, such a device is installed on other cars. The easiest way to put a mechanical device. The electric sensor cannot be installed because there is no corresponding indicator lamp on the instrument panel.
