Surge brake.

Surge brake. A self-contained, permanently closed hydraulic brake system for trailers that relies on inertial forces, developed in response to the braking action of the towing vehicle, applied to a hydraulic device mounted on or connected to the tongue of the trailer, to slow down or stop the towed vehicle.


49 CFR § 393.5

Scoping language

As used in this part, the following words and terms are construed to mean:

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