49.5. How will a loss of tightness in the brake chamber on one side affect the vehicle during braking?
UAЯк позначиться на автомобілі порушення герметичності гальмівної камери з одного боку під час гальмування?
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This exam question from the Traffic Rules of Ukraine concerns road safety and the technical condition of the vehicle. The braking system must operate evenly on the left and right wheels of the same axle; otherwise, during deceleration, the vehicle becomes less controllable, the risk of skidding increases, and the braking distance becomes longer. That is why the traffic rules require drivers to check the technical condition of the car before departure and while driving.
The question tests knowledge of the sections of the Traffic Rules regarding the driver's duties and technical requirements, specifically points 2.3, 31.1, 31.4, and 31.4.1, which prohibit operation if the hydraulic or pneumatic brake system loses its integrity. If the brake chamber (a drive element) loses its integrity on one side, the pressure in that circuit/mechanism drops, one wheel brakes weaker, the other stronger, and asymmetry of braking forces occurs. As a result, it is important to understand for the theoretical exam that the vehicle will veer toward the side with the more effective brake during braking.
The analysis of the answer options is based on the physics of braking and the norms of the Traffic Rules: the statement that this will not affect the vehicle is incorrect, because uneven braking changes the trajectory even without turning the steering wheel. The option about “loud hissing” may sometimes accompany air leakage in a pneumatic system, but this is neither the main nor a necessary manifestation in the context of controllability, which this exam question checks. The practical conclusion for the student: if the car pulls to one side during braking or there are signs of reduced brake efficiency, operation should be stopped and the malfunction eliminated, since driving with a depressurized brake system is prohibited by the traffic rules.
Clause 2.3 (driver's duties)
To ensure road safety, the driver is obliged to: check and ensure the technical serviceability and completeness of the vehicle before driving; monitor its technical condition while driving and, in case of malfunctions that are prohibited for operation according to these Rules, take measures to eliminate them, and if this is impossible — proceed to a parking or repair location while observing safety precautions.
Application to the question: depressurization of the brake chamber (an element of the brake actuator) is a technical malfunction of the braking system, which changes the effectiveness of wheel braking and affects controllability.
Clause 31.1 (general requirements for technical condition)
The technical condition of vehicles and their equipment must comply with standards related to road safety and environmental protection, as well as the rules for their operation.
Application to the question: the serviceability and uniform action of the brakes on the wheels of an axle are part of the safety requirements; loss of airtightness leads to abnormal brake operation.
Clause 31.4 (prohibition of operation in case of malfunctions)
The operation of vehicles is prohibited under the law if the following technical malfunctions and conditions are present.
Application to the question: loss of airtightness in the brake actuator is a malfunction for which operation is prohibited, since braking becomes dangerous and unpredictable.
Clause 31.4.1 (brake systems)
Loss of airtightness of the hydraulic brake actuator; loss of airtightness of the pneumatic or pneumohydraulic brake actuator.
Application to the question: depressurization of the brake chamber on one side causes different braking force on the left/right wheels of the axle, which results in the vehicle pulling to one side during braking.
Thus, the correct answer is "The vehicle will pull to one side.", given that according to the definition in the Traffic Rules, loss of airtightness in the brake actuator is a malfunction of the braking system, which leads to uneven braking action on the wheels and, as a result, to the vehicle pulling to one side during braking.
During braking, the vehicle should decelerate evenly, without changing its direction of movement. This is only possible when the braking mechanisms of the right and left wheels on the same axle create approximately the same braking force. That is why the proper condition of the braking system and its airtightness is important for traffic safety requirements.
If the airtightness of the brake chamber (or brake drive element) is compromised on one side, the pressure in this circuit/mechanism decreases: part of the working medium (fluid or air, depending on the type of system) does not provide the required force. As a result, the brake pads on the “problem” wheel are pressed less tightly than on the opposite side, and the wheel brakes less effectively.
This creates a difference in braking forces: one wheel slows down more, the other less. Due to this asymmetry, the vehicle begins to “pull” to one side when the brakes are applied, that is, it changes its trajectory without turning the steering wheel. Usually, the deviation is felt towards the wheel that brakes more effectively, because greater rolling resistance is created there.
For example, if the right brake chamber has lost its airtightness and the right wheel brakes less, the left wheel will decelerate more, and the driver will feel the vehicle pulling to the left during braking. This is noticeable even with moderate pressure on the pedal, and with intensive braking, it becomes even more pronounced.
Therefore, the correct answer is "The vehicle will be pulled to one side," since a loss of airtightness on one side reduces the braking force on that wheel, creates uneven braking between left and right, and causes the vehicle to deviate to the side during braking.