53.3. What can be the consequence of complete wear of the brake pad friction linings?
UAЩо може стати наслідком повного зносу фрикційних накладок гальмівних колодок?
Question without image
This is an exam question from the Traffic Rules of Ukraine concerning the technical condition of a vehicle and road safety, specifically how the state of the brakes affects the ability to stop in time. In real conditions, even a slight loss of braking efficiency increases the braking distance and raises the risk of an accident, so knowing the causes and consequences of brake component wear is important for everyone preparing to take the theoretical exam.
The question tests the section of the Traffic Rules regarding the technical condition and operation of vehicles, specifically the requirements of points 31.1, 31.4, and 31.4.1 regarding the serviceability of the service braking system and its compliance with efficiency standards. When the friction lining is completely worn out, the pad loses the material that creates friction with the disc or drum, so the braking mechanism sharply loses its ability to effectively slow down the car. This is the key consequence, which is directly related to the Traffic Rules requirements for safe operation.
The analysis of the options in this exam task is as follows: a sharp drop in braking efficiency is the most direct and guaranteed result of complete pad wear, since without the friction layer, the force applied to the pedal does not translate into sufficient braking. Overheating of the braking mechanism is possible as an accompanying effect due to improper contact and increased metal-to-metal friction, but this is not the main consequence that determines the answer. Loss of controllability may also occur indirectly due to uneven braking, but the root cause of the danger is still that the brakes stop working properly, and the braking distance increases sharply.
Clause 31.1
The technical condition of vehicles and their equipment must comply with the requirements of standards related to road safety and environmental protection, as well as the rules of technical operation, manufacturers' instructions, and other regulatory and technical documentation.
Application to the question: complete wear of the friction linings of brake pads directly impairs brake performance and leads to non-compliance with braking efficiency requirements.
Clause 31.4
The operation of vehicles is prohibited under the law if there are such technical malfunctions and non-compliance with the requirements of standards.
Application to the question: if due to worn pads the brake mechanism loses efficiency, this is grounds for prohibiting operation (since there is a malfunction/non-compliance with the requirements of standards).
Clause 31.4.1 (Brake system)
The service brake system does not work or its efficiency does not meet the requirements of standards.
Application to the question: complete wear of the friction linings causes a sharp drop in braking efficiency, i.e., a situation where the efficiency of the service brake system does not meet the requirements of standards.
That is, the correct answer is "A sharp decrease in the efficiency of the brake mechanism," given that according to the Traffic Rules, the efficiency of the service brake system must meet standards, and complete wear of the friction linings directly leads to the loss of this efficiency.
The friction linings on brake pads create the necessary friction with the brake disc or drum. It is precisely due to this friction that the vehicle slows down and stops. As long as the lining has normal thickness, the braking mechanism works predictably and provides the required braking force.
When the linings are completely worn out, there is essentially no friction material left. In this situation, the pad cannot properly “grip” the disc or drum, the contact becomes worse, and the driver's effort on the pedal does not translate into sufficient braking. In practice, this manifests as a sharp increase in stopping distance: for example, in a familiar spot before an intersection, the driver presses the brakes, but the car slows down much less than expected.
In addition, with complete wear, metal parts of the pad may come into contact with the disc or drum. This not only accelerates damage to the components, but also makes braking unstable and less effective, especially when heated. As a result, the braking system loses its main property — reliably stopping the vehicle at the right moment, which directly contradicts the requirements of safe operation.
Therefore, the correct answer is "A sharp decrease in the effectiveness of the braking mechanism," since complete wear of the friction linings deprives the brakes of the necessary friction with the disc or drum and drastically impairs the vehicle's ability to brake effectively.