Differences Between DOT 3 and DOT 4 in General and in GP.

Detailed breakdown of DOT 3 vs. DOT 4 brake fluid and what makes each type unique: What Is Brake Fluid? Brake fluid is a hydraulic fluid used in your vehicle’s braking system. When you press the brake pedal, the fluid transfers that force to the brake calipers, which then press the pads against the rotors to slow or stop the car. It must be: Non-compressible Resistant to moisture Stable under high temperatures Key Differences Between DOT 3 and DOT 4 Feature DOT 3 DOT 4 Base Composition Glycol Ether Glycol Ether + Borate Ester Dry Boiling Point ~205°C (401°F) ~230°C (446°F) Wet Boiling Point ~140°C (284°F) ~155°C (311°F) Water Absorption Slower Faster Performance Suitable for regular driving Better for high-performance or heavy-duty use Cost Generally cheaper Slightly more expensive The boiling point is crucial because brake fluid heats up during braking. If it boils, it can create gas bubbles, leading to brake failure. Compatibility...