Drag Specialties Front Master Cylinder Rebuild Kit – Harley Shovelhead 1973–1981 – 3/4" Bore – Replaces OEM 45063‑72

OVERVIEW

This Drag Specialties front master cylinder rebuild kit is engineered specifically for restoring hydraulic braking performance on vintage Shovelhead‑era motorcycles. Designed exclusively for 3/4" imperial bore front master cylinders, the kit provides a complete set of replacement seals, pistons, and hardware to eliminate spongy lever feel and fluid leaks. It serves as a direct, drop‑in equivalent to Harley‑Davidson OEM part number 45063‑72.

ENGINEERING & PERFORMANCE

Rebuilding with these factory‑matched components restores consistent hydraulic pressure and precise lever modulation across the entire stroke diameter. The internal piston and seal geometry are engineered to meet or exceed OEM tolerances, ensuring reliable fluid containment and smooth piston travel under repeated thermal cycling. Because every element replicates original dimensional standards, the upgraded master cylinder maintains authentic stock operation without requiring adapter fittings or complex system bleeding procedures.

KEY FEATURES

• Complete front master cylinder rebuild kit containing all essential seals, pistons, and hardware
• Engineered specifically for 3/4" bore (Imperial) master cylinders
• Direct replacement equivalent for Harley‑Davidson OEM part number 45063‑72
• Manufactured to meet or exceed original equipment performance standards
• Restores proper brake pressure and improves manual lever engagement
• High‑quality construction components built for extended service intervals

TECHNICAL SPECIFICATIONS

• Brand: Drag Specialties
• Part Name: Front Master Cylinder Rebuild Kit
• Part Type: Controls / Hardware
• Supported Years: 1973–1981
• Compatible Trims: FL, FLH, FLTC, FLT, FLHS, FXB, FXE, FXEF, FXS, FXWG, XLCR, XLT, XLS, XLCH, XLH

FITMENT

• Harley Sportster / XL Family (1973–1981)
• Harley Softail / FX Family (1973–1980)
• Harley Touring / FL & FLT Family (1973–1981)

WHY HARLEY RIDERS CHOOSE THIS

Riders tackling Shovelhead restorations rely on this kit because it resolves the most common hydraulic failures found on decades‑old master cylinders without swapping the entire assembly. The precision‑machined pistons and reinforced seals work together to deliver firm lever action that mimics factory fresh conditions, eliminating the gradual fade that develops over time. By matching exact Imperial bore dimensions and OEM mounting patterns, technicians gain a straightforward maintenance path that preserves the motorcycle’s original styling while significantly improving stopping reliability.