If a hydraulic brake system uses neoprene rubber packing materials, which hydraulic fluid should be used?

In a hydraulic brake system that utilizes neoprene rubber packing materials, the use of a water-based fluid is appropriate due to compatibility considerations. Neoprene rubber is resistant to a variety of fluids, but water-based hydraulic fluids, such as water-glycol solutions, are often specifically designed to be compatible with rubber materials while preventing degradation and ensuring reliable performance.

Water-based fluids can provide the necessary lubrication and cooling characteristics required in hydraulic systems, particularly in situations where there is a risk of high temperatures. They also typically offer advantages regarding fire resistance compared to oil-based fluids.

Mineral base oils, alcohol-based fluids, and vegetable oils can potentially degrade neoprene rubber or affect the integrity of the packing materials over time. This could lead to leaks or system failures. Thus, when neoprene is present in a hydraulic system, choosing a water-based hydraulic fluid ensures that the materials remain unaffected and the system functions efficiently.