49.7. Choose the correct answer.
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This exam question from the Traffic Rules of Ukraine concerns road safety as it relates to the technical condition of the vehicle. The braking system is critical for control: any difference in braking efficiency between the left and right wheels on the same axle can cause the car to "pull" to one side during braking, increase the risk of skidding, and worsen the predictability of the vehicle's behavior, especially on slippery roads or during emergency stops.
The question tests understanding of the driver's responsibilities regarding the vehicle's roadworthiness before departure and during operation, that is, the section of the Traffic Rules on technical condition and driver responsibility (in particular, the requirements of points 2.3 and 31.1 of the traffic rules). In the theoretical exam, it is important to know that any brake maintenance must ensure even braking on the wheels of one axle, and not create an imbalance.
The correct approach in this situation is related to paired replacement: if you replace the brake pads only on one side, the new friction linings will work more efficiently than the worn ones on the other side, resulting in a difference in braking forces. Therefore, the option requiring replacement of the pads on both sides of the same axle is logical and meets the requirement to maintain the vehicle in technically sound condition; meanwhile, the idea of "swapping the linings" is not a correct repair practice and does not eliminate the cause of the differing efficiency, and checking the pressure in the reservoirs may only be relevant for certain systems and does not solve the key problem of uneven braking after a one-sided replacement.
Clause 2.3 (subclause "a")
To ensure road safety, the driver is obliged: before departure, to check and ensure the technical serviceability and completeness of the vehicle, as well as the correct placement and securing of the load.
Brief application: replacement of brake pads must be carried out so that after the work the braking system remains technically sound and provides safe braking without the vehicle "pulling" to the side.
Clause 2.3 (subclause "b")
To ensure road safety, the driver is obliged: in the event of technical malfunctions on the road, with which operation is prohibited according to these Rules, or a danger that the driver is able to detect, he must take measures to eliminate them, and if this is impossible — proceed by the shortest route to a place of parking or repair, observing safety precautions.
Brief application: uneven brake efficiency on wheels of the same axle (in particular due to different wear levels/types of pads on the left and right) creates a hazard and must be eliminated by proper repair.
Clause 31.1
The technical condition of vehicles and their equipment must comply with the requirements of standards relating to road safety and environmental protection, as well as the rules of technical operation, instructions of manufacturing enterprises, and other regulatory and technical documentation.
Brief application: manufacturer instructions and safety standards require symmetrical operation of brakes on wheels of the same axle; therefore, pads are replaced in pairs (on both wheels of the axle) so as not to cause a difference in braking forces and loss of control during braking.
That is, the correct answer is "When replacing brake pads on one side, you must also replace the pads on the other side," given that, according to the definition of the Traffic Rules, the driver is obliged to ensure the technical serviceability of the vehicle before departure and to maintain the technical condition in accordance with standards and manufacturer instructions, and uneven braking reduces traffic safety.
When preparing a car for operation, the Traffic Rules require that its technical condition ensures road safety. The braking system is one of the key safety elements, so its operation must be even and predictable on both wheels of the same axle.
Imagine the situation: you replaced the pads only on the left wheel because the right ones are "still kind of okay." New pads have a different thickness and better contact with the disc (or drum), so the braking force on the left will become noticeably greater than on the right. At the moment of braking, this creates a difference in forces on the wheels of the same axle, and the car may start pulling towards the side where the braking is stronger. On a slippery road or during emergency braking, such a difference can provoke a loss of stability and control.
In addition, uneven braking leads to improper wear: on one side, the parts work more intensively, and on the other — worse, which causes uneven wear of the discs (or drums) and pads. This reduces the effectiveness of the brakes and increases the risk of malfunctions, which directly contradicts the requirement to operate a technically sound vehicle.
Therefore, in maintenance practice, the rule is applied: brake pads are replaced in pairs on the wheels of one axle (either both front or both rear) to ensure identical brake operation on the left and right and to maintain vehicle stability during braking.
Thus, the correct answer is: "When replacing brake pads on one side, you must also replace the pads on the other side," because only paired replacement on one axle ensures even braking and does not create a dangerous imbalance in handling.