Mechanical Backing Plates
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9-inch Mechanical Backing Plate - Suits 9-inch Drums
A 9-inch mechanical backing plate is actuated by the brake lever causing two identical shoes to apply a braking force into a cast-iron brake drum.
Brake shoes and brake discs are known as friction brakes. Vehicle brakes are also friction brakes; however, these braking systems may be hydraulic or electric brakes.
Installation of the Brake Shoes
However, please pay attention to the shoe offset below when installing into a drum.
Locate the handbrake on the bottom of the axle.
Backing Plate Ranking
13-inch to 14-inch wheels 1450kg. 15-inch to 16-inch wheels is 1200kg
Brake Shoes
9-inch x 45mm. Maximum cable tension during braking is 165kg. Hole spacings are 76.15mm P.C.D.
Occasionally, it is better to replace the whole backing plate as other components may be showing wear. A four-hole post mount fixes mechanical braking plates welded to the axle, behind the rear grease seal.
The job becomes more manageable, removing a few bolts then replacing the whole backing plate. Entire backing plates are relatively inexpensive.
How to replace 9-inch Brake Shoes
- Take off the wheel, remove the grease cap and split pin and take off the drum.
- Remove the worn brake shoes.
- Keep the springs in a container ready for re-insertion.
- Check that there is grease on the backing plate under the lever assembly (at the bottom), use molybdenum grease as required.
- Assemble the new backing plate shoes with the springs between the shoes, as shown in the image above.
- The longer spring must be assembled in the lower position, the shorter spring in the top place. Note that left-hand side brakes are a mirror image to right-hand side brakes.
Fit the drum over the brake shoes and reassemble.
Why do my trailer brakes fade?
- Dirt, oil or grease on the brake shoes - clean
- Worn brakes shoes - replace
- Badly adjust brake shoes - adjust
- Trailer overloaded causing brakes to overheat - reduce trailer weight or upgrade trailer.
Mechanical Backing Plate Associated Parts
Additional information
| Weight | 3 kg |
|---|---|
| Dimensions | 8 × 25 × 25 cm |
| Select Size | 9" |
| Select Side | Left, Right |
