Correct answer
In the transmission
It is installed in the drivetrain. In an electromagnetic retarder, the rotors turn with the transmission while the stator remains fixed; magnetic effects produce torque opposing rotation without service-brake friction. It is not fitted within the service-brake drums or discs. Depending on the design, it can be mounted in the propeller shaft with chassis support or on the gearbox or axle; not every model has the same mounting. It is an auxiliary brake and does not replace the service brake for every purpose.
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In the discs
In the brake drums
In the transmission
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