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Answer :
Final answer:
Both technicians may have valid points; excessive air leakage or different brake linings can affect a tractor's air brake system efficiency. Diagnosing such issues involves understanding brake system operation principles and recognizing the severe safety implications of brake system faults.
Explanation:
Both Tech A and Tech B could potentially be correct in their assessment of the issues causing poor stopping on a tractor with an air brake system. Tech A suggests that there could be excessive air leakage at the exhaust valve in the service brake relay valve.
This leakage could cause a loss of air pressure, leading to the brakes not applying with the necessary force required for efficient stopping. Tech B, on the other side, mentions that the issue could be due to different types of brake linings installed on some of the tandem axle wheels. Different brake linings can have varying coefficients of friction and wear differently, which might result in uneven braking and consequently poor stopping performance.
Understanding the principles of hydraulic brakes and air brakes is crucial for diagnosing problems. For instance, hydraulic brakes operate based on Pascal's principle, while air brakes, as in the case of this tractor, are sometimes less efficient due to the compressibility of the gas. The correct operation of brakes is critical for vehicle safety as seen in Counter Example Situation 3, where a manufacturer's liability was established due to known faults in the brake system.
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