Retarders are used to further improve the braking performance on commercial vehicles. Like engine brakes, they are wear-free continuous brakes. Retarders relieve the service brake and increase the active safety and cost-effectiveness of commercial vehicles. ... The braking effect depends on vehicle speed.

Do retarders keep you from skidding?

Q: Retarders keep you from skidding when the road is slippery. True or False? A: False. Your wheel may skid when roads are wet.

How does a retarder work?

An engine retarder captures the exhaust from the engine and compresses it so that the engine must work harder to push the gas out of the cylinders, and it therefore retards and slows the engine through resistance.