Brakes that work using the deceleration force present as the tow vehicle stops. The trailer tongue has a pivot point that moves forward as the tow vehicle slows. When the driver applies the tow vehicle brakes, the surge brake coupler’s internal master cylinder compresses against the coupler body, forcing brake fluid through the brake lines to the wheel cylinders which forces the brake shoes against the drum (or pads against the rotor, if equipped with the newer disc brakes). There is no wiring or electrical needed. This type of brake is common on boat and equipment trailers.
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