Wilwood 250-15858 2.50" Offset EPB Backing Plate for Universal Rear Axle w/EPB

Vehicle Fitment

• Universal fit for rear axle applications with 2.50-inch axle flange offset
• Compatible with vehicles using Wilwood Electronic Parking Brake (EPB) systems

Fitment Notes

• Designed specifically for Electronic Parking Brake (EPB) caliper mounting applications
• Requires 2.50-inch axle flange offset measurement for proper fitment
• Must be used with compatible Wilwood EPB calipers and mounting brackets (sold separately)
• Not compatible with traditional mechanical parking brake cable systems
• Axle offset must be verified before ordering to ensure proper caliper and rotor alignment

Features

• Manufactured from high-strength aluminum alloy providing exceptional durability while significantly reducing weight compared to steel OEM backing plates
• Black powder coat finish delivers superior corrosion resistance and professional appearance that complements Wilwood brake components
• Precision-engineered 2.50-inch offset design ensures proper positioning of EPB calipers relative to brake rotors for optimal performance
• Integrated steel 5/16-24 clinch nuts provide secure, reliable mounting points for EPB caliper brackets and accessories without backing out under vibration
• Universal design accommodates a wide range of rear axle applications including Ford Big New Style, custom rear ends, and aftermarket axles
• CNC-machined mounting surfaces ensure flat, true installation for proper caliper alignment and reduced rotor runout
• Open-end design allows installation with axle shafts in place, simplifying brake upgrades without requiring complete axle disassembly
• Compatible with Wilwood's complete Electronic Parking Brake system including control modules, wiring harnesses, and EPB calipers

Specifications

• Axle Flange Offset: 2.50 inches
• Material: High-strength aluminum alloy
• Finish: Black powder coat
• Mounting Hardware: Steel 5/16-24 clinch nuts (integrated)
• Application: Rear axle Electronic Parking Brake systems
• Design: Open-end backing plate (C-shaped configuration)
• Compatible Rotor Sizes: 11.00 to 14.00 inches (depending on caliper bracket selection)
• Weight: Approximately 1.5 pounds per backing plate
• Position: Rear axle (sold individually)

Included Components

• 1x Wilwood 250-15858 EPB backing plate with integrated clinch nuts

Product Description

The Wilwood 250-15858 Electronic Parking Brake (EPB) backing plate is a precision-engineered component designed specifically for rear axle applications utilizing Wilwood's innovative electric parking brake system. Manufactured from high-strength aluminum alloy and finished with durable black powder coating, this backing plate provides the essential mounting foundation for EPB calipers while significantly reducing weight compared to traditional steel backing plates. The 2.50-inch offset specification is critical for proper brake system geometry, ensuring that EPB calipers and hydraulic calipers are positioned correctly relative to the brake rotor for optimal performance, pad wear, and stopping power. This universal-design backing plate is compatible with a wide range of rear axle applications including Ford Big New Style axles, custom-built rear ends, and various aftermarket axle housings that feature a 2.50-inch axle flange offset.

The backing plate features integrated steel 5/16-24 clinch nuts that are permanently installed into the aluminum body, providing secure and reliable mounting points for EPB caliper brackets and accessories. These clinch nuts eliminate the need for separate hardware retention and prevent loosening under extreme vibration and thermal cycling. The CNC-machined mounting surfaces ensure flat, true installation that minimizes rotor runout and promotes proper caliper alignment throughout the life of the brake system. The open-end C-shaped design is a significant installation advantage, allowing the backing plate to be installed with the axle shafts remaining in place, which simplifies brake system upgrades and eliminates the need for complete axle disassembly, bearing removal, and seal replacement that would be required with traditional full-circle backing plates.

This backing plate is specifically designed for use with Wilwood's Electronic Parking Brake system, which utilizes compact electric motor-driven calipers to provide reliable parking brake function without traditional mechanical cables and levers. The EPB system delivers 2,400 pounds of clamping force and is controlled via an electronic switch and control module, providing modern convenience and eliminating cable routing challenges in custom builds, hot rods, and restomod applications. When ordering the 250-15858 backing plate, it is essential to verify your axle's flange offset measurement, which is the distance from the axle flange mounting surface to the centerline of the brake rotor mounting surface. This measurement must match the 2.50-inch specification for proper fitment. Additional components required for a complete EPB brake system include EPB calipers, EPB caliper mounting brackets, hydraulic calipers, hydraulic caliper brackets, brake rotors, control module, wiring harness, and control switch (all sold separately). Whether building a custom hot rod, upgrading a classic muscle car, or installing modern braking technology in a restomod project, the Wilwood 250-15858 EPB backing plate provides the precision-engineered foundation for a reliable, high-performance electronic parking brake system.