2 ptsD,D1Official number: 7687
Which of the following functions does the retarder in a bus serve?
Explanation
Correct answer: It ensures constant braking during a lengthy downhill drive.
A retarder, also known as a speed retarder, is an auxiliary braking system intended for prolonged braking of a vehicle without using the service brakes. Its main purpose is to maintain a constant speed on downhill gradients, which prevents the service brakes from overheating and losing their effectiveness. As a result, they remain fully effective in the event that an emergency stop is necessary.