Brake Fluids Explained: Types, Compatibility, & Lifespan!

What's the difference between DOT 5 and DOT 3, 4, and 5.1? How often does brake fluid need to be changed or flushed? What makes brake fluid go bad? That and more is explained here!

Your brakes are one of the most vital safety item in your vehicle, and having them work properly is important. Hydraulic brakes are found on nearly every car ever made, and having the brakes controlled by fluid allows for many advanced features, like ABS brakes and stability control. The occasional brake fluid change can keep moisture and contaminants out of the brake system and allow these parts to work at their best.

DOT 2 brake fluid was an early brake fluid formula that you will probably never come across. DOT 3 brake fluid is the basic, modern, glycol ether formula of brake fluid. DOT 4 brake fluid adds borate ester to the glycol ether to increase both the wet and dry boiling points.

What's the brake fluid wet VS dry boiling point? It's the danger zone where your brake fluid becomes a compressible gas due to the heat. The wet VS dry part is referring to how much water the brake fluid has absorbed from the air, which lowers its boiling point.

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