Match the part number, measurements and connection points that apply to your trailer.
| Connection | Confirm ball or lunette size. |
|---|---|
| Mount | Verify tongue, channel and mounting pattern. |
| Capacity | Meet or exceed the required rating. |
Automatic braking power for hydraulic drum trailers—No in-cab controller required. Engineered for marine and utility environments with high-corrosion resistance.
This Demco surge actuator is the ultimate "set it and forget it" solution for trailers with hydraulic drum brakes. By utilizing the trailer's momentum, the internal slide compresses a master cylinder to apply braking pressure automatically as the tow vehicle slows. With a 7,000 lb GTW capacity and heavy-duty zinc plating, it is a high-quality replacement solution for boat, car, and utility trailers where moisture and heavy loads are a daily reality.
Surge systems are ideal for multi-vehicle fleets because they don't require an electric brake controller in the truck. This unit is specifically valved for drum systems and is marine-ready with a 120-hour salt spray rating.
Compatibility: Designed exclusively for hydraulic drum brakes. Fits 2" hitch balls only.
Vehicle / System Fit: Mounts to straight 3" wide trailer tongues. Commonly used on boat, car, and utility trailers.
Installation Notes: Bolt-on design. Requires Grade-5 or Grade-8 hardware (3" on-center spacing). Ensure your brake lines are clean before connecting.
Performance Insight: The composite master cylinder is a game-changer—it won't pit or rust like traditional cast-iron versions, ensuring long-term reliability.
Selling Brand: Demco / R&P Carriages
Application Reference: Any OEM names such as Atwood or Titan are used to describe compatibility and retrofit style only.
What This Means: This listing is for a genuine Demco assembly, designed as a direct retrofit for most straight 3" channel applications.
Before Ordering: Verify your tongue width is exactly 3", your brake system is hydraulic drum (not disc), and your hitch ball size is 2".
Upgrading from an old Atwood or Titan? This unit is a direct retrofit for most straight 3" channel applications. Check these critical points before ordering to avoid fitment issues:
Fast, secure hookups. Just drop onto the ball and listen for the "click" to confirm it's locked.
Zinc-plated steel finish rated for 120 hours of salt spray—perfect for marine environments.
Glass-reinforced nylon construction won't rust or pit, featuring a large reservoir and moisture-sealing cap.
Large rear rollers and a sturdy steel case ensure the inner slide moves freely for smooth, consistent braking.
| Specification | Detail |
|---|---|
| Part Number | 8605001 |
| Brand | Demco |
| Towing Capacity | 7,000 lbs GTW |
| Tongue Weight | 700 lbs Max |
| Material / Finish | Zinc-Plated Steel |
| Ball Size | 2" |
| Fitment | 3" Wide Straight Tongue |
| Bolt Spacing | 3" On-Center |
| Hardware | Grade 5 or 8 (Not Incl.) |
| Category | Details |
|---|---|
| System Type | Surge Hydraulic Braking |
| Primary Fit | 3" Channel Bolt-On |
| Replacements | Atwood / Titan Retrofit |
| Brake Type | Hydraulic Drum Only |
| Notes | Verify your tongue width is 3". Master cylinder is not designed for disc brake pressure requirements. |
| Quantity | Item |
|---|---|
| 1 | Demco 7K Surge Actuator Main Assembly |
| 1 | EZ-Latch 2" Ball Coupler (Integrated) |
| 1 | Glass-Reinforced Nylon Master Cylinder (Pre-installed) |
| 1 | Breakaway Safety Cable with Snap Hook |
| Note | Mounting hardware (bolts) not included. |
