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What may be the cause of lack of tightness in the pneumatic braking system applied in buses?

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Official question no. 6932

This question applies to categories: D, D1

Active navigation category: D1

What may be the cause of lack of tightness in the pneumatic braking system applied in buses?
1. A damage to air valves.
2. Excessive clearance on brake shoes spreaders/star wheel adjusters.
3. Worn brake rotors.
Polish driving license training exams - Category D1