GMA Engineering Kelsey Hayes Rear Master Cylinder 5/8 Bore for 1979-1984 Harley-Davidson FL FX XL

GMA Engineering Kelsey Hayes Rear Master Cylinder 5/8 Bore for 1979-1984 Harley-Davidson FL FX XL

Replacing a worn rear master cylinder does not have to mean compromising on feel. The GMA Kelsey Hayes-style unit restores the crisp, fade-resistant braking that gave these Harley-Davidson models their confident road manners – precision-engineered to spec so your foot finds exactly the same pressure it expects every time.

Key Features

• Direct Kelsey Hayes-style replacement for the factory rear master cylinder on compatible 1979-1984 Harley-Davidson models
• CNC-machined billet 6061 aluminum construction reduces weight and resists corrosion over the long term
• Available in Natural machined, Polished, and Black anodized finishes
• 5/8-inch bore delivers factory-correct pedal feel and consistent brake line pressure
• Complete with piston, spring, and boot kit for a ready-to-install upgrade

Technical Specifications

• Bore Size: 5/8 inch
• Material: Billet 6061 aluminum
• Finishes: Natural, Polished, Black
• Includes: Piston, spring, and boot kit
• Made in: USA

Fitment Notes

• Fits 1979-1984 Harley-Davidson FL, FX, and XL models equipped with Kelsey Hayes-style rear master cylinder
• Review the Fitment tab for the complete year and model breakdown
• Verify your OEM master cylinder style before ordering – Kelsey Hayes and Wagner styles are not interchangeable