Self-Adjusting Braking Power for 5.2K–7K Trailer Axles

The TRP TruRyde BK-12E-01SA / BK-12E-02SA is a self-adjusting electric trailer brake assembly available in Left Hand (BK-12E-01SA) or Right Hand (BK-12E-02SA) configurations, designed for smooth, consistent braking performance on 5,200 lb to 7,000 lb axles.

This upgraded self-adjusting design automatically maintains proper brake shoe tension, reducing maintenance and improving braking consistency over time — especially on trailers that see frequent use. Fully assembled and ready to install, this is a direct bolt-on replacement for most standard 12" x 2" electric drum brake systems.

🔧 Select Your Side

Choose Left Hand (LH / Driver Side) or Right Hand (RH / Passenger Side) from the dropdown above. Single-axle trailers need one of each; tandem-axle trailers with brakes on both axles need a pair of each. Always replace brakes in matching pairs for even wear.

⚙️ Key Features

• TruRyde Self-Adjusting Design: automatically maintains proper shoe-to-drum clearance — no crawling under the trailer with a brake spoon
• Side-specific configuration: LH (driver) and RH (passenger) sold individually — select above
• Direct Bolt-On Replacement: for most standard 12" x 2" electric drum brake systems
• Complete assembly: backing plate, shoes, magnet, springs, adjuster, and hardware — ready to install
• 7,000 lb rated per pair / 3,500 lb per assembly
• 5-bolt mounting flange: standard pattern — fits Dexter, AL-KO, Lippert, Rockwell, and other major axle brands
• Fits 14-1/2" to 16-1/2" wheels

📐 Specifications

• Manufacturer: TruRyde
• Part Numbers: BK-12E-01SA (Left Hand) / BK-12E-02SA (Right Hand)
• Brake Size: 12" × 2"
• Brake Type: Electric, self-adjusting
• Axle Rating: 5,200–7,000 lbs (per pair)
• Capacity: 3,500 lbs per individual assembly
• Mounting: 5-bolt flange
• Wheel Fitment: 14-1/2" to 16-1/2"

🔄 Cross Reference & Compatible Parts

• Dexter Equivalent (Self-Adjusting Nev-R-Adjust): Dexter K23-464-00 (LH) / K23-465-00 (RH)
• Dexter Equivalent (Manual Adjust): Dexter K23-180-00 (LH) / K23-181-00 (RH)
• Dexter Assembly Numbers Replaced: 023-458-00 / 023-459-00 (self-adjusting)
• Compatible Axles: Dexter, AL-KO, Besser Pro, Quality, Lippert, Rockwell 5.2K–7K axles

🔧 Common Applications

• Utility, cargo, equipment, boat, snowmobile, and car hauler trailers (5.2K–7K axles)
• Upgrading from manual-adjust brakes to eliminate routine adjustment
• Replacing worn or failed brake assemblies

⚠️ Important: This is an ELECTRIC brake — requires a brake controller in the tow vehicle (not included). Always replace in matching pairs.

💡 Pro Tip: After installation, burnish new brakes by applying 20–30 stops from 40 to 20 mph. Self-adjusting brakes will automatically maintain proper clearance during normal forward operation thereafter.

Questions? Call or text AAA Trailer at 517-225-1991 — we stock TruRyde, Dexter, Lippert, and Ultra-Fab brakes, hubs, and running gear. Same-day shipping from Howell, Michigan.

📞 Call/Text: 517-225-1991   🌐 AAATrailer.com

What sets us apart is our dedicated team of knowledgeable professionals who are always ready to assist. Great customer service isn't just a promise—it's the foundation of our success. We invite you to visit our showroom or reach out for personalized advice. Whether you're purchasing online or stopping by, we're here to make your trailer journey seamless. Visit Us Today

• Address: 4675 East Grand River Ave, Howell, MI 48843
• Phone: (517) 225-1991 (Call or text)
• Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment

Thank you for considering AAA Trailer. We're excited to help you hit the road with confidence! If you have any questions, don't hesitate to contact us.

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