LAJBZ Proportional Trailer Brake Controller Kit — Compact Inertia Sensor, Digital Display, 3 Boost Levels

LAJBZ Proportional Trailer Brake Controller Kit provides inertia-based, proportional braking that matches your vehicle's deceleration for smoother, safer stops.

Whether you're towing a boat, RV, utility trailer or cargo load, this compact electronic brake controller gives you predictable stopping power without complex setup. The unit uses an internal inertia sensor to apply trailer brakes in direct proportion to how your tow vehicle slows, reducing jerky stops and uneven brake wear. A self-leveling design eliminates the need for perfect alignment during installation, and the bright digital display keeps braking status and diagnostics easy to read at a glance.

How does proportional braking improve towing control?

Proportional braking automatically applies the trailer brakes in relation to your vehicle’s deceleration rather than a fixed timed output. That creates a smoother, more coordinated stop and reduces the tug-and-push sensation between truck and trailer. The result is steadier handling and less strain on both tow vehicle and trailer braking components.

• Inertia sensor measures real-time deceleration for matched brake force
• Eliminates abrupt, timed-only braking behavior
• Reduces trailer brake wear and tow-vehicle stress

What adjustments can I make for different loads and terrain?

The controller offers three boost settings plus a manual override so you can fine-tune braking intensity for heavy loads or steep grades. Boost increases maximum output when extra stopping power is needed, while the manual lever lets you apply the trailer brakes independently for slow maneuvers or trailer control. Settings are straightforward to change and shown on the digital display for quick confirmation.

• Three selectable boost levels for light to heavy loads
• Manual override lever for on-demand trailer braking
• Clear digital readout of current boost and connection status

How easy is installation and what vehicles are supported?

Installation is designed to be quick: the unit supports plug-and-play wiring via vehicle-specific harnesses (sold separately) and offers flexible mounting with a bracket or snap-in clip. Self-leveling means you do not need precise angling during mounting, and the controller supports 12V electric brakes on trailers with 1–3 axles (up to six brake assemblies).

• Plug-and-play wiring with compatible vehicle harness (sold separately)
• Flexible mounting options and 180° adjustment range
• Works with trailers having 1–3 axles, up to six brake assemblies

What diagnostics and protections are included?

The built-in digital display provides continuous status updates and diagnostic alerts so you can spot issues before they become problems. The controller includes circuit protection to guard against electrical faults and is engineered for long-term reliability under towing conditions. Lifetime after-sales support helps with setup questions and troubleshooting.

• Bright digital display for connection and diagnostic alerts
• Circuit protection against common electrical faults
• Lifetime customer support and a straightforward return policy

Who is this for: The LAJBZ Proportional Trailer Brake Controller Kit is ideal for recreational boaters, RV owners, weekend DIY haulers, and professional drivers who need dependable, adjustable trailer braking. If you tow light to medium trailers equipped with 12V electric brakes and want smoother stops, easier installation, and clear diagnostic feedback, this controller is built to deliver consistent performance without complicated setup.