Hayes

MC assembly Prime Pro Left

The Hayes MC Assembly Prime Pro Left brings precision braking performance back to your ride with the same confidence and control that made the Prime Pro system a favorite among serious riders. Designed as a complete replacement master-cylinder and lever body, this assembly restores smooth hydraulic modulation and consistent braking feel, whether you’re dialing in your trail bike or maintaining your gravity setup. Built to deliver durable performance and dependable response, it’s a key component for riders who expect their brakes to perform flawlessly on every descent.

• Complete lever and master-cylinder assembly for quick, reliable replacement
• Left-side configuration designed for Prime Pro hydraulic systems
• Restores precise modulation and consistent brake feel
• Durable construction built to handle aggressive riding conditions
• Compatible with existing hoses and fittings (sold separately)

When stopping power matters most, the Hayes MC Assembly Prime Pro Left ensures your hydraulic system delivers the smooth, predictable control you rely on every time you pull the lever.