The 31-5110-HF is a fully assembled left-hand hydraulic brake backing plate designed for 7,000 lb trailer axles using 12" x 2" drum brakes. It includes all internal components—brake shoes, springs, and wheel cylinder—pre-installed and ready for bolt-on replacement. Ideal for trailers equipped with surge or hydraulic brake systems, it delivers dependable performance and simplified maintenance.

Features:

• Complete left-hand hydraulic brake assembly
• Pre-installed shoes, springs, and wheel cylinder
• 12" x 2" brake size for 7K-rated axles
• Free-backing design for surge/hydraulic brake systems
• Bolt-on fitment for Dexter®, Lippert®, and other standard 7K axles

Specifications:

• Part Number: 31-5110-HF
• Axle Rating: 7,000 lbs
• Brake Size: 12" diameter x 2" width
• Side: Left-hand (driver side)
• Mounting Flange: 5-bolt pattern
• Brake Type: Hydraulic (free-backing)
• Includes: Backing plate, brake shoes, springs, wheel cylinder (fully assembled)
• Application: Suitable for dump, equipment, flatbed, and livestock trailers

Fitment:

• For use on 7K trailer axles with 12" x 2" hydraulic drum brakes
• Common on trailers using Dexter®, Lippert®, and similar brake systems
• Pair with right-hand version: 31-5111-HF for complete axle setup