What is the Difference Between Good and Bad Brake Fluid?

1 Answers
Briella
07/30/25 7:15am
Brake fluid quality is distinguished based on its grade. The following are the differences between good and bad brake fluid: 1. High-temperature performance: Poor-quality brake fluid has inferior high-temperature resistance and is prone to vaporization under high temperatures, forming easily observable bubbles. This creates air resistance in the brake system pipelines, hindering the proper flow of brake fluid. 2. Corrosion to metal objects: Brake fluid mixed with methanol or blended alcohols and water can be highly corrosive to metal objects. Placing a metal object in the fluid and observing whether it rusts can help identify its quality. 3. Kinematic viscosity: Brake fluid has the characteristic of kinematic viscosity, which refers to its flowability at low temperatures. In extremely cold northern regions, qualified brake fluid can still flow normally, while inferior brake fluid may exhibit varying degrees of solidification. In this state, the brake fluid essentially loses its braking performance. Moreover, if the brake fluid freezes and expands, it can rupture the brake lines, leading to even more severe consequences.
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