Product Description
The AL-KO 12" Electric Brake Backing Plate is a genuine AL-KO complete electric brake assembly designed for 2500kg trailer axles fitted with 12" × 2" electric drum brakes.
Available in both Left-Hand (P/N 331301) and Right-Hand (P/N 331300) configurations, each backing plate is supplied fully assembled with brake shoes, adjuster, springs and a genuine AL-KO 339300 electric brake magnet, making installation quick and straightforward.
Designed for heavy-duty trailer applications, this backing plate features an integrated park brake lever and is compatible with both AL-KO and Dexter 12" electric hub drums.
Please note: Backing plates are sold individually. For a complete axle, you will require one left-hand and one right-hand backing plate.
Features & Benefits
- Genuine AL-KO product
- Available in Left-Hand (331301) or Right-Hand (331300)
- Complete ready-to-install brake assembly
- Designed for 2500kg trailer axles
- 12" × 2" electric brake assembly
- Genuine AL-KO 339300 electric brake magnet
- Pre-adjusted brake shoes
- Brake adjuster fitted
- Complete return spring and hold-down hardware
- Integrated park brake lever
- Pre-wired magnet leads
- Suits both AL-KO and Dexter 12" electric hub drums
- Designed for Australian heavy-duty trailer applications
Specifications
| Specification | Details |
|---|---|
| Brand | AL-KO |
| Part Numbers | LH 331301 / RH 331300 |
| Brake Size | 12" × 2" |
| Brake Type | Electric Drum Brake |
| Axle Capacity | 2500kg |
| Mounting Pattern | 5 Bolt |
| Mounting Hardware | Not Included |
| Brake Magnet | Genuine AL-KO 339300 Standard Magnet |
| Park Brake Lever | Included |
| Backing Plate Sold As | Individual LH or RH Assembly |
Complete Ready-to-Bolt-On Assembly
Each backing plate is supplied fully assembled with:
- Genuine AL-KO Brake Shoes
- Genuine AL-KO 339300 Electric Brake Magnet
- Brake Adjuster
- Return Springs
- Hold-Down Springs & Pins
- Actuating Arm
- Park Brake Lever
- Pre-Wired Magnet Leads
Simply bolt the backing plate to the axle flange, connect the wiring and adjust the brakes during installation.
Brake Compatibility
This backing plate is designed to suit:
- AL-KO 12" Electric Hub Drums
- Dexter 12" Electric Hub Drums
Suitable for electric drum brake systems only.
Not suitable for hydraulic drum brake systems.
Suitable Applications
Ideal for:
- Heavy-duty caravans
- Horse floats
- Plant trailers
- Machinery trailers
- Livestock trailers
- Heavy-duty boat trailers
- General-purpose trailers fitted with 2500kg axles
Left-Hand vs Right-Hand
Available in two versions:
Left-Hand (LH)
Part Number: 331301
Right-Hand (RH)
Part Number: 331300
Backing plates are sold individually.
For a complete axle, purchase:
- 1 × Left-Hand Backing Plate
- 1 × Right-Hand Backing Plate
For optimum braking performance, we recommend replacing both backing plates at the same time.
What's Included
Each backing plate includes:
- Brake Shoes
- Genuine AL-KO 339300 Electric Brake Magnet
- Brake Adjuster
- Return Springs
- Hold-Down Springs & Pins
- Actuating Arm
- Park Brake Lever
- Pre-Wired Magnet Leads
What's Not Included
- Mounting Studs
- Mounting Nuts
- Brake Drum
- Brake Cable
Will This Fit My Trailer?
Before ordering, confirm the following:
✔ 2500kg axle
✔ 12" × 2" electric drum brakes
✔ 5-bolt mounting flange
✔ Electric brake system
✔ AL-KO or Dexter 12" hub drum
If these specifications match your existing backing plate, this assembly is suitable for your trailer.
Complete Your Brake Service
We recommend replacing or inspecting the following components at the same time:
Brake Components
Electrical Components
Installation Tips
- Replace both backing plates together for balanced braking performance.
- Inspect the brake drum for wear before installation.
- Check the brake magnet contact surface for scoring or excessive wear.
- Adjust the brake shoes after installation.
- Re-adjust after the initial bedding-in period.
- Test the electric brake controller before towing.
Frequently Asked Questions
Is this sold individually?
Yes. Each backing plate is sold individually.
Do I need one or two?
A single axle requires:
- 1 × Left-Hand
- 1 × Right-Hand
Does it include the brake shoes?
Yes. Brake shoes are already fitted.
Does it include the brake magnet?
Yes. It includes the genuine AL-KO 339300 electric brake magnet.
Does it include the adjuster and springs?
Yes. The backing plate is supplied fully assembled.
Does it include mounting studs or mounting nuts?
No. Mounting studs and mounting nuts are not included.
Does it suit Dexter hub drums?
Yes. It is compatible with Dexter 12" electric hub drums as well as AL-KO 12" electric hub drums.
Does it suit hydraulic drum brakes?
No. This backing plate is designed for electric drum brake systems only.
Why Buy From Trailer Spares Online?
- Genuine AL-KO products
- Australia's trailer braking specialists
- Expert technical advice
- Fast Australia-wide shipping
- Large range of AL-KO brake components
- Competitive pricing and local support
Shipping is calculated at checkout based on your location.
- Sold individually — choose left or right side
- Heavy-duty 12″ electric brake backing plate with park lever provision
- Suits 12" electric drum hubs (2″ width)
- Mounting: 4‑bolt (2.875" / 73 mm center-to-center)
- Rated to 2500 kg per axle
- Includes brake shoes, springs, pre-wired harness, and park brake lever
- Fitted with a quality AL‑KO standard magnet for consistent braking performance
- Recommended to replace both left and right sides at the same time for balanced wear and safety