Which of the following statements about retarders is correct?

Retarders are devices used to help slow down a vehicle, particularly heavy trucks, by redirecting some of the engine’s power. Option B is accurate because retarders indeed reduce the need for traditional braking. This is particularly important for large vehicles that can generate significant momentum and require more distance and time to come to a stop. By using a retarder, the driver can maintain control over speed on downhill grades and during deceleration, allowing the brake system to cool and reducing wear and tear.

While retarders have many benefits, they do not always offer advantages in every scenario or weather condition. For instance, in slippery conditions, the use of a retarder could lead to a loss of traction, which is why it’s essential to understand the specific contexts in which they are effective.