To prevent the brake arm from grabbing, the moment of friction force should be:

• A. Less than the total required braking effort
• B. More than the total required braking effort
• C. Equal to the total required braking effort
• D. None of the above

Answer: (A)

In order to prevent the brake arm from grabbing, it is essential that the moment of friction force be less than the total required braking effort. This ensures that the braking system functions smoothly and allows for controlled and gradual stopping without abrupt engagement that can lead to grabbing.

When the moment of friction force is kept below the total required braking effort, it helps to distribute the braking force evenly and avoid sudden stops. This not only enhances the safety and stability of the vehicle during braking but also prolongs the life of the braking components by reducing wear and tear caused by excessive friction.

Maintaining the moment of friction force at a lower level compared to the total braking effort allows for effective modulation of brake pressure, leading to smoother operation and better control in various driving conditions.