A simple tool for testing the percentage of water in brake fluid essential for regular safety checks on your brakes Green Battery OK No water found. Yellow Less than 1% water No action necessary. Yellow/Yellow 2% Water found Check regularly. Yellow/Yellow/Red 3% Water found Change brake fluid. Yellow/Yellow/Red/Red 4% Water found Brake Fluid should be changed immediately.

• Identify percentage of water in brake fluid.
• Suitable for Dot 3, Dot 4, Dot 5
• Quick and simple tool with battery
• Colour coded LEDs show level of water.
• Not suitable for silicone based Dot 5.1