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eBay£755.81Visit shop Trailer Brake Drums for Knott 203x40 Brake Shoes 139.7mm PCD 4 Stud M12 4pk
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The AB Tools Trailer Brake Drums (IND059_4PK) are designed for trailer owners and technicians maintaining Knott braking systems with 203x40 shoe configurations. These durable replacement drums are engineered to restore braking performance in trailers requiring a 4-stud 139.7mm PCD fitment, providing a reliable solution for replacing corroded or worn-out components. A critical caveat is that these drums are exclusively compatible with units featuring casting reference 7717; installation must be preceded by verifying this specific number on your current drum to ensure safety and fitment.
| Model Part Number | IND059_4PK |
|---|---|
| Brand | AB Tools |
Check your existing drum for the '7717' casting number and ensure your brake shoes are 203x40mm.
No, these drums require standard 50mm hub caps which are sold separately.
No, these are strictly designed for a 4-stud wheel fitment with a 139.7mm PCD.
The internal braking surface diameter is 203mm.
While not strictly required, it is best practice to replace drums across the same axle simultaneously for balanced braking performance.
Ensure the brake shoe adjuster is fully backed off to allow maximum clearance for the drum.
Check that the dust shield is not bent and rubbing against the drum surface; ensure the drum is fully seated.
Verify that all lug nuts are torqued evenly and the drum is properly centered on the hub.
Before starting installation, ensure the trailer is securely supported on jack stands and wheels are chocked. To verify compatibility, inspect the rear of your existing brake drum for the engraved casting reference number 7717. Do not attempt installation if your existing parts do not match this reference. Ensure your trailer uses M12 wheel bolts and standard 50mm hub caps. During installation, clean the hub spindle thoroughly and apply a light coating of bearing grease. Always torque wheel bolts to the manufacturer's recommended specification using a torque wrench. Regular maintenance involves inspecting the drum interior for grooves or excessive scoring and checking that the drum rotates freely without binding after the brakes are adjusted.
