Understanding the Viscosity of Glycerine and Oil in Hydraulic Brakes

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Glycerine has a higher viscosity than oil, but its use in hydraulic brakes is limited by several factors beyond viscosity. Key requirements for brake fluids include lubricity, bulk modulus, boiling point, and temperature stability. The fluid must effectively transmit and amplify the force from the brake pedal while withstanding extreme temperatures without freezing or boiling. Additionally, it should not corrode brake components or absorb water. Therefore, high viscosity alone does not make glycerine a suitable choice for hydraulic brake systems.
purvangthanki
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Viscocity of glycerine is high than that of oil then why it can't be used in hydraulic brakes..?
 
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I'm sure there are many more requirements than viscosity. Lubricity, bulk modulus, and boiling point are the first things that pop into mind.
 


The hydraulics in a brake system only need to transmit and multiply the input force applied at the brake pedal. In addition, the fluid needs to withstand high and low temperatures (not freeze or boil), not corrode the brakes, brake lines, or any soft components of the system, not absorb water, etc. Having a high viscosity doesn't necessarily indicate a superior brake fluid, and would probably be unusable in cold temperatures.
 

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