The Wilwood brake fluid reservoir level sensor cap provides an easy way to add a low-fluid warning circuit to your brake system. It uses standard automotive 12V DC male terminals, providing reliable long-term service and straightforward electrical installation. Designed as a direct replacement cap for Wilwood 118ml (4 oz) brake fluid reservoirs. Features: Genuine Wilwood replacement level sensor cap Designed for 118ml (4 oz) Wilwood reservoirs Standard automotive 12V DC male terminals Easy electrical connection Provides brake fluid level monitoring Durable construction Ideal for street, performance, and motorsport applications Please Note: This cap only fits Wilwood 118ml (4 oz) reservoirs. It will not fit directly onto any of the master cylinders sold on our website. If you don't already have a compatible reservoir, you will need to purchase the Wilwood 118ml (4 oz) reservoir (Part No. WR118) or select the complete reservoir kit from the drop-down menu.