The Hayes Dominion Master Cylinder Reservoir Cap is a genuine replacement part designed for use with Hayes Dominion hydraulic brake systems.

Designed to meet Hayes’ exact specifications, this reservoir cap seals the master cylinder’s fluid chamber, helping keep brake fluid clean and protected from contaminants like dirt, moisture, and air. A proper seal is essential for consistent brake performance and lever feel, making this cap ideal for replacing cracked, worn, or lost components during routine maintenance or repairs.

Key features:

• Genuine Hayes replacement reservoir cap
• Designed for Hayes Dominion brake master cylinders
• Seals fluid reservoir to prevent contamination
• Precision-made for reliable fit and performance
• Ideal for brake servicing and maintenance