Fluids are vital to a vehicle’s life. They are exposed to extreme pressures, temperatures, moisture, and contaminants. Most people are aware of the need to change their engine oil since it gets dirty as a byproduct of combustion. Other fluids will also become less effective at lubrication and corrosion protection as they oxidize and become saturated with contaminants. The longer they go the less they are able to lubricate and protect. Accelerated wear of internal components is the result. This would include manual and automatic transmissions, transfer cases, differentials, and power steering systems. Brake fluid by nature absorbs water from the air and as a result will corrode internal brake components like master cylinders and ABS units as well as lowering the boiling point of the fluid. Replacing the fluids on schedule removes the contaminants and refreshes their lubrication and corrosion abilities.