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: for complete axle setup
