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Square Drawbar Overrun Brakes for Trailers — Selection by Weight Capacity and Towbar Type
Square section overrun brakes — also commonly referred to as box tube inertia brakes, square towbar overrun hitches, or straight drawbar overrun couplings — are engineered for trailers featuring a straight square or rectangular drawbar profile. These units provide automatic trailer braking during vehicle deceleration. The system operates via inertia: as the towing vehicle slows down, the forward force of the trailer compresses the coupling, transferring braking force from the hitch through the overrun assembly to the wheel brakes. The pricepy.com.ua catalog offers square drawbar overrun brakes across various load capacities manufactured by leading brands AL-KO and KNOTT.
Key Features of Square Section Overrun Brakes:
- Designed for Straight Box Tube Drawbars. These models mount directly onto trailers with straight square/rectangular profiles, securing the coupling housing seamlessly to the trailer frame.
- Selected by Gross Vehicle Weight Rating (GVWR). Square overrun hitches are engineered for different weight classes — from lightweight utility trailers to heavy-duty commercial platforms — making accurate capacity matching essential.
- Reliable Braking Force Transmission. The internal mechanism utilizes a sliding drawbar shaft, hydraulic damper, and linkage levers to ensure smooth and predictable force transfer to the wheel brakes.
- Component Compatibility. Individual replacement parts are available for service and maintenance, including ball couplers, overrun dampers, brake cables, and operating levers.
Construction and Operating Principle of Box Section Inertia Brakes
A straight drawbar overrun brake consists of a outer housing, sliding shaft, hydraulic shock absorber, ball coupling, and a transfer linkage connected to the wheel brake cables. When the towing vehicle brakes, the trailer moves forward by inertia, compressing the overrun shaft. Through mechanical levers and tension cables, force is applied directly to the wheel brake shoes, allowing the trailer to decelerate in sync with the tow vehicle.
How to Choose the Right Square Drawbar Overrun Hitch?
- Gross Trailer Mass (GTM / GVWR). The primary selection criteria. The overrun brake capacity must match your trailer's maximum permissible weight and axle specifications.
- Drawbar Dimensions and Profile. Verify the drawbar dimensions — square tube, rectangular profile, or custom sizing — as well as the mounting hole pattern before purchasing.
- Coupling Head Compatibility. Ensure ball hitch lock compatibility, mounting bolt hole spacing, and overall fitment for your specific trailer setup.
- Manufacturer and Spare Parts Availability. Opting for genuine AL-KO and KNOTT components guarantees reliable operation and simplifies future maintenance or repair.
Benefits of Square Drawbar Overrun Couplings
Square section overrun brakes offer a durable braking solution for trailers built with straight box or rectangular steel drawbars. They ensure optimal force distribution from the tow hitch to the wheel brakes, maintaining vehicle stability during heavy braking and towing. Heavy-duty housing construction, premium components, and precision internal engineering guarantee a long service life even under demanding commercial haulage.
Orders, Pricing, and Delivery Across Ukraine!
Kiyashko Trailer Manufacturing produces custom-built trailers tailored to any specification. You can purchase square drawbar overrun brakes directly on our website or by contacting our team at +38 (099) 302-07-07. Our technical experts will assist in selecting the correct overrun hitch based on trailer weight, drawbar profile, and operating conditions. Fast nationwide delivery is available across Ukraine.