A “surge” actuator is a crucial component in trailer braking systems, especially for trailers designed to carry heavy loads. Here's how it works:

• Surge Actuator Mechanics:
  • The actuator operates by the “surge” or “push” of the trailer toward the tow vehicle during braking.
  • This surge causes the actuator to telescope together, applying force to the master cylinder.
  • The master cylinder then supplies hydraulic pressure to the brakes, synchronizing the trailer brakes with the tow vehicle's axle brakes.
  • A built-in, sealed, and independent dampening shock absorber controls the telescoping action, ensuring smooth and controlled braking.