Best Flat Tow Braking System: 5 Options Compared

Flat towing your vehicle behind an RV gives you the freedom to explore once you reach your destination. But without a proper braking system, you risk safety and legal compliance.

This guide compares five top flat tow braking systems to help you choose the one that fits your needs, budget, and vehicle type. Each option is reviewed based on its unique features and benefits.

Blue Ox BRK2022 Patriot – Compact All-Electric Braking

The Blue Ox BRK2022 Patriot is a new, smaller profile (8 x 7.5 x 11.5 inches) that fits more towed vehicles and weighs only 6.2 lbs—a significant reduction from the previous 9.5 lbs. Its all-electric design delivers faster extension of braking action for quicker, more responsive stops, and it automatically checks brake pressure during setup and continuously monitors it while towing.

The in-coach controller features an extended RF range and a supercapacitor lifetime battery, so you never need to replace batteries. A breakaway system is included for added safety. This portable unit is ideal if you want a lightweight, compact system that sets up quickly and provides reliable, responsive braking.

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• New Design: It is a new smaller profile that fits more towed vehicles (8 X 7.5 X 11.5); it has a new lighter design that is 6.2 lbs vs the 9.5 lbs of the previous patriot brake
• Brake Pressure: It automatically checks brake pressure during setup and continuously monitors brake pressure during towing
• Responsive Stops: It has a faster braking time; it has faster extension of the braking action for quicker and more responsive stops
• Extended RF Range: In-Coach controller with an extended RF range and has supercapacitor lifetime battery; break-away included
• Vehicle Compatibility: This works on all vehicles including hybrids; this brake will not work with the Fiat 500 due to the design of the car’s round brake pedal

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CURT 52202 RVibrake 4 – Portable Rapid Braking

The CURT 52202 RVibrake 4 is a portable flat tow brake system that enhances your towed vehicle’s braking power for improved control and stability. Its rapid 0.5-second reaction time ensures quick stops, and the simple one-button interface automatically positions the unit in your vehicle for a hassle-free setup. The built-in audio provides feedback during operation.

Designed for convenience, this system is thin, lightweight, and easy to transport thanks to a built-in carrying handle. The only installation required is for the breakaway kit, which adds security. If you value portability and ultra-fast braking response, this system is a strong contender for your flat towing needs.

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• SUPERIOR SAFETY & COMPLIANCE — The CURT RVibrake 4 enhances your towed vehicle’s braking power, improving control and stability. With a rapid 0.5-second reaction time, it ensures smooth, reliable stops. Plus, it meets legal requirements in 49 states and all of Canada, keeping you compliant on every journey
• EASY, AUTOMATIC POSITIONING — Featuring a simple one-button interface, the RVibrake 4 automatically positions itself in your vehicle for a hassle-free setup. The built-in audio assistant guides you through installation in just 30 seconds, eliminating guesswork and ensuring a seamless towing experience
• LIGHTWEIGHT, PORTABLE DESIGN — Designed for convenience, this tow brake system is thin, lightweight, and easy to transport. A built-in carrying handle makes it simple to move and store, ensuring you can take it anywhere your RV adventures lead
• BREAKAWAY KIT FOR ADDED SECURITY — The only installation required is for the breakaway kit, which takes just 25-45 minutes. This crucial safety feature ensures your towed vehicle stops independently if it detaches, providing extra peace of mind on the road
• BACKED BY A LIMITED LIFETIME WARRANTY — With a limited lifetime warranty, you can trust RVibrake to deliver dependable, stress-free towing for years to come

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Roadmaster 8700 Invisibrake – For Vacuum Brakes

The Roadmaster 8700 Invisibrake is designed for towed vehicles with vacuum-powered brakes. Unlike systems that work on a ‘dead’ brake pedal, InvisiBrake energizes your power brakes so you have the same braking power while towing as you do normally. It includes an emergency breakaway system for added safety.

This unit is compact (8 x 8 x 2 inches) and can be mounted under the driver’s seat, rear seat, or behind interior panels without sacrificing passenger space. It connects directly to the towed vehicle’s battery and trickle-charges it during towing. Made in the USA, this system is ideal if you have a vacuum-brake vehicle and want a permanent, out-of-sight solution.

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• Product Compatibility: The Roadmaster Invisibrake Support Braking System with Emergency Breakaway System fits Towed Vehicles with Vacuum-Powered Brakes
• Power Brakes: Most braking systems work on a 'dead' brake pedal. InvisiBrake energizes your power brakes so that you have the same power braking system while towing as you do while driving.
• Out of Sight: InvisiBrake is so small (8" x 8" x 2") it can usually be mounted under the driver's seat, under the rear seat, behind interior panels or in the trunk, without sacrificing any of the vehicle's usable space
• Full Power: InvisiBrake connects directly to the towed vehicle's battery and trickle-charges the battery during towing; InvisiBrake will never drain the battery
• Made in the USA: Premium products, handcrafted by American workers, Roadmaster is a true American manufacturer that builds its products to last

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CURT 52201 RVibrake Shadow 2 – Permanent Braking

The CURT 52201 RVibrake Shadow 2 is a permanently installed flat tow brake system that provides reliable braking power with an ultra-fast 0.5-second reaction time, keeping you in control and reducing stopping distance. Once installed, it requires no setup before each trip—tow-mode detection automatically activates the system when you connect your towed vehicle.

This system includes a built-in 10-amp battery charger that keeps your towed vehicle’s battery charged while traveling, preventing dead batteries. Designed for plug-and-play installation, it simplifies the wiring process. If you prefer a set-it-and-forget-it solution that works seamlessly every time, the RVibrake Shadow 2 is an excellent choice.

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• ENHANCED SAFETY WITH RAPID BRAKING — The CURT RVibrake Shadow 2 provides reliable braking power with an ultra-fast 0.5-second reaction time, keeping you in control and reducing stopping distance for a safer towing experience. It helps prevent dangerous situations and protects your vehicle while on the road
• HASSLE-FREE, PERMANENT INSTALLATION — Once installed, this system requires no setup before each trip, making flat towing easier than ever. With tow-mode detection, it automatically recognizes when you're towing and activates the brakes, eliminating the need for manual adjustments or extra steps
• SMART BATTERY CHARGING TECHNOLOGY — The built-in 10-amp battery charger ensures your towed vehicle’s battery stays charged while you travel. This added functionality helps prevent battery drain and keeps your system running efficiently without any extra effort from you
• SIMPLE, PLUG-AND-PLAY INSTALLATION — Designed for quick and easy installation, this system requires no wire crimping, soldering, or disassembly. It comes with all necessary components and is guaranteed to fit most vehicles, ensuring a smooth setup with minimal effort
• BACKED BY A LIMITED LIFETIME WARRANTY — With a limited lifetime warranty, you can trust in its quality and dependability for every adventure, no matter where the road takes you

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Blue Ox BRK2019 Patriot 3 – Universal All-Electric

The Blue Ox BRK2019 Patriot 3 is a universal-fit all-electric brake system that offers faster response braking compared to older models. Its in-coach controller features an extended RF range, allowing reliable communication between the coach and the towed vehicle. The all-electric design eliminates the need for vacuum or hydraulic connections.

This system is designed for easy setup and provides consistent braking performance. Note that it is an international product, so fit, age ratings, and labeling may differ from local versions. If you need a straightforward all-electric system that works with a wide range of vehicles, the Patriot 3 is a dependable option.

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• Fit Type: Universal Fit
• In-coach controller with extended RF range
• All electric design, faster response braking time
• International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions

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Buyer’s Guide: What to Consider

Choosing a flat tow braking system depends on your vehicle, budget, and how often you tow. Focus on installation type, braking response, and safety features.

• Portable vs. Installed: Portable systems are easy to move between vehicles; installed units are permanent but require no setup before each trip.
• Braking Response Time: Faster reaction times (e.g., 0.5 seconds) improve safety and control during sudden stops.
• Electric vs. Vacuum: All-electric designs offer quicker, more consistent braking than vacuum-based systems.
• Breakaway Protection: Built-in breakaway kits automatically apply brakes if the towed vehicle detaches, adding critical safety.
• Monitoring & Charging: Systems that monitor brake pressure and charge the towed vehicle's battery reduce maintenance and ensure reliability.

Conclusion

Choosing the right flat tow braking system comes down to your towing habits and vehicle setup. For portability and quick setup, the Blue Ox BRK2022 Patriot or CURT 52202 RVibrake 4 are excellent choices.

If you prefer a permanent, hassle-free solution, the CURT 52201 RVibrake Shadow 2 or Roadmaster 8700 Invisibrake offer reliable performance. The Blue Ox BRK2019 Patriot 3 remains a solid all-electric option for universal fit.