Final answer:
The proper angle for an S-cam brake slack adjuster to pushrod when fully applied should be more than 90 degrees. This angle ensures effective force transfer and brake application. Incorrect adjustment can lead to inefficient braking and safety hazards. Option b is the correct answer.
Step-by-step explanation:
When discussing the proper adjustment of an S-cam brake slack adjuster, the angle between the slack adjuster and the pushrod is a critical factor for effective braking performance. The optimal angle ensures that the brakes apply and release effectively without causing unnecessary wear or posing a safety risk. The most suitable position for this angle is when it is more than 90 degrees. This provides for better brake application as it ensures a more effective transfer of force from the slack adjuster to the brakes.
It is essential to understand that incorrect adjustment leads to inefficient braking, which can be dangerous. Therefore, regular maintenance and inspection are crucial to ensure that the angle remains correct, especially after long periods of service or when parts are replaced or adjusted. Professional mechanics usually conduct these adjustments with specific tools designed to maintain the proper angles and operation of the braking system.
In conclusion, the correct angle for the slack adjuster to pushrod when the S-cam brake is in the fully applied position should ideally be more than 90 degrees. This is the mention correct option answer in the final answer to the student's question.