Manitoba Airbrake Practice Exam

What is the maximum air loss allowed in one minute on a tractor with two or more trailers?

1. 2 psi

2. 4 psi

3. 6 psi

4. 8 psi

The correct answer is: 6 psi

The maximum air loss allowed in one minute on a tractor with two or more trailers is 6 psi. This is the industry standard and is set to ensure safe driving conditions. Option A (2 psi), B (4psi), and D (8 psi) are incorrect because they do not align with the industry standard and may cause unsafe driving conditions. Option A (2 psi) is too low and may indicate a leak or equipment malfunction, while option D (8 psi) is too high and may lead to brake failures or sudden drops in tire pressure. Option B (4 psi) is also too high and could result in decreased vehicle handling and increased stopping distance. Therefore, C (6 psi) is the most suitable and safe option for maximum air loss allowed in one minute on a tractor with two or more trailers.