All Balls Master Cylinder Rebuild Kit – Harley Softail, Dyna Wide Glide, FXR Series 1986‑1995 – FLST, FLSTC, FLSTF, FXST, FXSTC, FXSTS, FXLR, FXRS, FXDWG – OEM 45072‑87 Replacement

OVERVIEW

This rebuild kit restores reliable front brake performance by replacing worn internal components in select older Harley-Davidson motorcycles. Designed as a direct replacement for OEM part 45072-87, the kit ensures secure sealing and consistent lever operation for enhanced safety during rides. The assembly includes essential boots, springs, and seals crafted from premium materials compatible with classic Softail, Dyna, and FXR frames.

ENGINEERING & PERFORMANCE

Direct integration allows this kit to restore smooth, consistent master cylinder operation without modifications to existing brake reservoirs. High-quality rubber boots and precision-engineered seals deliver leak-free performance that withstands repeated pressure cycles and road vibration. Engineered for extended service life, the included metal hardware maintains correct piston tension to eliminate sponginess and ensure immediate braking response. This component addresses common wear points that compromise control on vintage platforms, returning the brake system to its original design standards.

KEY FEATURES

• Direct replacement for Harley OEM 45072-87
• Restores smooth and consistent master cylinder operation
• Premium materials ensure durability and a reliable leak-free seal
• Includes complete service components: boot, screws, snap rings, springs, washers, and O-rings
• Dependable braking performance across multiple model families
• Compatible with Harley Softail, Dyna, and FXR applications
• Replaces worn internals to regain original design specifications

TECHNICAL SPECIFICATIONS

• Brand: All Balls
• Part Name: Master Cylinder Rebuild Kit
• Number: Replaces OEM 45072-87
• Construction: Premium rubber and metal components
• Supported Years: 1986–1995
• Compatible Family: Softail, Dyna, FXR

FITMENT

• Harley Softail (1986–1995)
• Harley Dyna (1993–1995)
• Harley FXR (1986–1995)

WHY HARLEY RIDERS CHOOSE THIS

Harley owners trust this kit because it provides a comprehensive solution to restore fading front brake performance without the cost of a full master cylinder replacement. Riders value the inclusion of every necessary seal, spring, and hardware piece, enabling a complete overhaul using high-quality materials resistant to fluid degradation. The precise engineering guarantees a smooth return to OEM lever feel and consistent stopping power over time. By addressing internal wear before it leads to failure, this rebuild kit preserves the authentic ride quality of classic Softail, Dyna, and FXr models.