12 X 2 5.2K HYD LH DS W/PARK

Dexter Axle Trailer Brake Assembly; Dexter 12 Inch Diameter x 2 Inch Width; Duo-Servo With Park Brake Assembly; Hydraulic Brake System; Drum Brake Type; 5200 Pound Axle; Left Side; With Brake 023-318-00/ Instruction Sheet 059-726-00; Boxed. Dexter offers several varieties of hydraulic trailer brakes. Your vehicle may be equipped with drum brakes or disc brakes. The hydraulic brakes on your trailer are much like those on your automobile or light truck. The hydraulic fluid from a master cylinder or actuation system is used to actuate the wheel cylinder which, in turn, applies force against the brake shoes and drum. The main difference between automotive hydraulic brakes and hydraulic trailer brakes is the trailers' actuation system. These systems respond to the braking signal from the tow vehicle and supply the required brake fluid volume and pressure to the trailer brakes. Duo-Servo The duo-servo brake uses a dual piston wheel cylinder to apply the brakes. This type of brake is typically used in an electric/ hydraulic, vacuum/hydraulic, or air/hydraulic system. A description of operation of this brake is as follows: When the brakes are applied, the double-acting wheel cylinder moves the primary and secondary shoes towards the drum. The frictional force between the brake drum and lining attempts to turn the primary shoe into the secondary shoe. The secondary shoe is forced onto the anchor pin and Backing Actuating Pin Plate from this point, the secondary Hold Down and primary Secondary Spring shoes attempt to Shoe 'wrap around'. Primary Shoe In essence, the Adjuster Spring brake has utilized Adjuster Assembly frictional force to help the applying force on both shoes. If the brakes are applied while the vehicle is backing, the shoes rotate in the direction of the drum rotation. This causes the secondary shoe to leave the anchor and causes the primary shoe to move against the anchor. Action of the brake is the same in reverse as forward. Diameter: 12 Inch Width: 2 Inch Brake System: Hydraulic Brake Type: Drum Axle Weight Capacity: 5200 Pound Position: Left Includes Backing Plate: Yes Includes Brake Shoes: Yes Includes Magnets: No Includes Actuating Lever: Yes Includes Adjusting Screw: Yes Includes Spring Hardware: Yes Estimated Install Time (Hours): 0.5"