MGM Brakes long stroke chambers for drum brakes offer tremendous value and durability. We are proud that our products already utilize corrosion resistant materials: such as A360 aluminum, epoxy coating, and clear trivalent chromate. Standard features such as our Corrosion Fighter Technology ensures precise alignment of the power spring inside the brake. Accurate alignment of the head side of the power spring compliments our center hole diaphragm (CHD) design: another standard feature in all TR 3-Inch Long Stroke Models: providing longer center seal and power spring life. Available models are the TR, which is ideal for over-the-road, regional, P&D, final mile applications for trucks, and trailers. Our TR-T model is ideal for heavy duty vocation applications, and trailers. Our TR-TS is the ultimate choice for severe service applications. Our LTS chamber is a long life, premium chamber for multiple applications. This model includes an integral release bolt. All our long stroke brakes have square ports for easy identification. Whichever model you choose, you will not be disappointed in the outstanding results. Piggyback Plus kits are available for some models. Tamper Resistant. Long Life Power Spring. Center Hole Diaphragm & Shield. Epoxy-Coated Head, NPC/Lower Push-Rod, Return Spring. HD NPC. Polymer Guide. HD Reinforced Diaphragm (or Neoprene). Stroke Alert. Molded Rubber Seal. Composite Guide.