Since electromagnetic and hydraulic driveline retarders operate independently of the engine's internal compression, they are exempt from the standard safety rule requiring drivers to turn off auxiliary retarders when navigating wet, icy, or snow-covered downgrades.
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False
The statement is false because the specific mechanism of the retarder does not change where the braking force is applied. All auxiliary retarders act on the drive wheels. Applying any retarder on a slippery surface can induce a loss of traction and a potential jackknife.
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All types of auxiliary retarders apply braking force to the drive wheels and must be turned off on slippery surfaces to prevent traction loss and skidding.