Practice question

What is 'Hydrodynamic Retarder / Transmission Retarder' and how does it function without wearing out friction brake pads?

A parachute deployed from the rear of the truck
A fluid coupling device in the transmission or driveline that uses hydraulic oil shear resistance between a rotor and stator to absorb kinetic energy and slow vehicle rotation, dissipating heat via the engine radiator
A set of magnets attached to the brake drums
A mechanical friction brake shoe that clamps the front axle

Answer: B — A fluid coupling device in the transmission or driveline that uses hydraulic oil shear resistance between a rotor and stator to absorb kinetic energy and slow vehicle rotation, dissipating heat via the engine radiator

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