Genuine Dexter 10" x 2-1/4" Hydraulic Uni-Servo brake assembly — a complete, factory-assembled brake unit for 3,500 lb trailer axles with surge (hydraulic) brake actuators. Available in Left Hand (K23-312-00) or Right Hand (K23-313-00). The single-plunger uni-servo design delivers smooth, responsive braking on boat trailers, utility trailers, and other surge-actuated trailers. Made in the USA by Dexter Axle.

🔧 Select Your Side

Choose Left Hand (LH / Driver Side) or Right Hand (RH / Passenger Side) above. Single-axle trailers need one of each; tandem-axle trailers need a pair of each. Replace brakes in matching pairs for even wear.

Key Features

• Genuine Dexter OEM – Made in USA: complete backing plate, shoes, wheel cylinder, hardware, and adjuster
• Uni-Servo (single-plunger) hydraulic design: for use with surge brake actuators — NOT electric brake controllers
• Brake size: 10" drum diameter × 2-1/4" shoe width
• Axle capacity: 3,500 lbs
• 4-bolt mount to the axle brake flange

Fitment

• Fits Dexter (and Dexter-pattern) 10" x 2-1/4" hydraulic brake flanges on 3,500 lb axles.
• For hydraulic / surge brake systems only — not for electric drum brakes.

Specifications

• Type: Hydraulic uni-servo drum brake assembly
• Size: 10" × 2-1/4"
• Capacity: 3,500 lb axle
• Actuation: Surge (hydraulic)
• Brand: Dexter Axle (Made in USA)

Interchange / Also Known As

Dexter K23-312-00 (LH) · K23-313-00 (RH) · MPN 023-312-00 / 023-313-00 · AAA SKU 856-0312 / 856-0313.

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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 We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.