Description
The 12K–15K Electric Trailer Brake Assembly, Part #31-5130, delivers strong and consistent braking for heavy commercial trailers. It handles extreme loads with confidence. It mounts on the left-hand (driver’s side) position. It fits 12K, 14K, and 15K trailer axles that demand durability and control.
First, the 12.25″ drum pairs with extra-wide 5″ brake shoes. As a result, friction area increases. Heat dissipates faster. Brake fade drops. Stopping feels smoother and more controlled, even when hauling heavy equipment, materials, or livestock. In addition, the self-adjusting system keeps the shoes properly set. Therefore, braking stays consistent while manual adjustments are reduced.
Next, the 12K-15K Electric Trailer Brake bolts directly to a standard 7-bolt brake flange. This matches many Dexter 12K–16K axles and other Dexter-style heavy-duty axle brands. Better yet, the assembly ships fully built. Brake shoes, magnet, springs, adjuster, and self-adjusting hardware come pre-installed. So installation goes faster. Alignment stays accurate right out of the box.
Because of its heavy-duty design, this brake assembly works well on equipment trailers, lowboys, goosenecks, and high-capacity flatbeds. It handles frequent use and sustained loads. Meanwhile, the wider shoes and rugged internals extend service life in tough commercial conditions.
Finally, proper break-in maximizes performance. After installation, complete 20–30 controlled stops from about 40 mph. Allow brief cooling periods between stops. Avoid hard braking at first. This process seats the shoes evenly, improves stopping power, and extends brake life.
Additional part #: 1215LHBRKAS, K23-442-00, KC4741-L, AKEBRK-12L
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