![]() Modern hydraulic surge couplers come complete with an in built breakaway lever which again is activated by a tether cable attached to the tow vehicle. If a fluid dampened coupler is used, braking sensitivity is increased and braking of the trailer becomes more proportional to the tow vehicle for both drum and discs. They are easy to install and set up, require less maintenance than drum brakes and spare parts are readily available. ![]() Hydraulic override/surge braking operating disc brakes are probably the most common type of braking on trailers up to 5500 lb. Disc brake load ratings range between 2000 lb up to 9000 lb per axle. Hydraulic drum brakes tend to have smoother braking over disc brakes, and this makes them especially suited to trailers where the cartage of livestock or fragile loads is undertaken.ĭrum brake load ratings are up to 9000 lb per axle although 3500 lb load rating is common. The hydraulic master cylinder attached to the spring or fluid dampened coupler softens the impact of the coupler motion and gives a proportional amount of braking control. The simplest braking is hydraulic surge braking and overall this system works well with both braking efficiency and control. Click here for more information on Trailer Couplers. Surge couplers are available for trailer braking up to 10,000 lbs. The rearward movement of the coupling "pumps" the master cylinder which sends pressurized brake fluid to the brakes (see below). As the tow vehicle brakes, the trailer "surges" forward, and this surging forces the movable part of the coupling backwards. Surge couplers use a spring or fluid dampened movable coupling head which uses the tow vehicles momentum and braking to operate a hydraulic master cylinder (a small manual hydraulic pump).
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