Pair of Bolt-On Backplate Assemblies for Knott 250x40 Brake Drums – Pre-Assembled

This pair of bolt-on backplate assemblies is a complete, ready-to-fit replacement for Knott 250 x 40 mm Auto-Reverse brake drums, used on a wide range of heavy-duty trailers. Designed for fast, bolt-on installation, these units come pre-assembled with Maypole brake shoes and springs and are ideal for Ifor Williams trailers manufactured after March 2014.

Key Features:

• Replacement for Knott 250 x 40 mm Auto-Reverse brake drums

• Compatible with Ifor Williams trailers made after March 2014

• Supplied as a matched left and right-hand pair

• Pre-fitted with Maypole brake shoes and springs

• Includes expander, adjuster, eyelet, and half shell – fully assembled

• Bolt-on design for quick and easy installation

• 58 mm diameter central hole for hub alignment

• 4 x 14.5 mm mounting holes with 71 x 71 mm hole centres

• Built to OEM specifications, sourced in Europe

• Durable, asbestos-free linings for safe, long-term use

Kit Contents:

• 1 x Left-hand bolt-on backplate assembly

• 1 x Right-hand bolt-on backplate assembly

• All components pre-mounted:
  – Brake shoes
  – Return and tension springs
  – Expander and adjuster units
  – Eyelet and half shell

Specifications:

• Brake Size: 250 mm diameter x 40 mm width

• Mounting Hole Diameter: 14.5 mm (4 holes)

• Hole Centres: 71 mm x 71 mm

• Central Bore: 58 mm

• Application: Ifor Williams trailers (post-March 2014), commercial and agricultural use

• Condition: New, factory-assembled, security-sealed

Pre-Fitted Convenience. Certified Performance. Long-Term Reliability.
Ideal for fast replacement and reduced downtime, this complete Knott-compatible backplate set ensures safe, balanced braking and long service life. Professionally assembled, ECE R90 approved, and ready to install—order today for efficient trailer maintenance.