Which of the following symptoms may indicate a malfunction of the air compressor of the brake system in the bus?

Explanation

Correct answer: Reduced pressure in the pneumatic system.

The task of the compressor is to generate sufficiently high pressure in the pneumatic braking system, which is essential for its correct operation. A malfunction of the compressor makes it impossible to achieve or maintain the required pressure; therefore, a reduced pressure level is the main symptom of this component's failure.

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