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What is brake-fluid?

2 Answers

OKai

07/24/25 1:58pm

Brake-fluid is the brake fluid, also known as braking oil or force oil. Below are the specific details about brake fluid: 1. Brake fluid is a liquid medium that transmits braking pressure in hydraulic braking systems, used in vehicles equipped with hydraulic braking systems. 2. Brake fluid is divided into three types: castor oil-alcohol type, synthetic type, and mineral oil type. The castor oil-alcohol type is composed of refined castor oil (45%-55%) and low-carbon alcohol (ethanol or butanol, 55%-45%). The synthetic type is made from ethers, alcohols, esters, etc., blended with additives such as lubricants, antioxidants, rust inhibitors, and rubber swelling inhibitors. The mineral oil type is made from refined light diesel fractions with thickeners and other additives.

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MacIsaac

08/11/25 7:54am

Last time I got my car repaired, the mechanic said brake fluid is indeed the hydraulic oil for brakes. This stuff is super important - it's like the blood of the braking system, transferring the force from your pedal to the brake pads. It's specially formulated to withstand extreme heat, as brake discs can reach several hundred degrees Celsius during braking. You must use the correct specification - there are DOT3, DOT4 and other types, mixing them can cause serious problems. The worst part is its hygroscopic nature, it absorbs moisture and degrades in about two years, making brakes feel spongy. My car just had its fluid changed last month - the mechanic warned that darkened fluid must never be used as it corrodes metal components.

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