If you're having issues with your trailer's electric brakes – maybe they're pulsing, locking up, or not working right – the modulator valve (or ECU) might be the culprit. This HonHuCo unit is a direct replacement for part numbers 4005001010, 4005001010X, 599-7001, and several others. It's the brain of your trailer's brake system, controlling the application and release of the brakes based on the signal from your tow vehicle. Important notes: This is for standard trailers built after March 2001. Do NOT use it with turntables, steerable axles, or dollies. Also, before you install it, it's crucial to \purge\ or exhaust the air from the line a few times to blow out any dirt or moisture that could damage the new unit. The company tests these before they ship and backs them with a 1-year warranty. Installation is straightforward for someone familiar with trailer brake systems, but if you're unsure, consult a professional. A reliable replacement to get your trailer stopping safely again.
