Due to concerns of the Utah Army National Guard, field testing was conducted by BRDEC personnel to determine if silicone brake fluid was the cause of unexplained brake incidents. Air dissolved in silicone brake fluid was thought to come out of solution when the vehicles traveled at high altitudes. To test this, two 2 1/2-ton and two 5-ton trucks were filled with silicone brake fluid and conventional brake fluid (one of each) and instrumented with pressure transducers, thermocouples, and linear resistors. The trucks were then run over a premarked course that traveled to altitudes of 8,100 feet, with sensor readings taken during each prescribed stop. The data recorded during each stop revealed fluid pressure, pedal travel, and wheel cylinder temperature. Analysis of the data gave no indication of loss of fluid pressure due to air evolving from the silicone brake fluid while at high altitudes. Only one brake incident occurred during the testing. Analysis of the data recorded during the incident indicated a severe case of brake fade, or the loss of friction between the brake linings and the brake drum due to excessive use of the brakes. Instead of dropping down to a lower gear while traveling down the mountain, the driver tended to ride the brakes causing high temperatures that reduced the friction between the brake drums and the brake linings. Pedal travel, brake fade, air-hydraulic (a/h) cylinder, master cylinder, silicone, polyglycols, one-way valve vent, two-way valve vent.
Silicone Brake Fluid Performance Investigation
1992
121 pages
Report
Keine Angabe
Englisch
Transportation Safety , Lubricants & Hydraulic Fluids , Logistics Military Facilities & Supplies , Brake fluids , Silicones , Air , Altitude , Army , Brakes , Feet , Fluids , Friction , Gears , Linings , Mountains , National guard , Personnel , Pressure , Pressure transducers , Resistors , Temperature , Test and evaluation , Thermocouples , Transducers , Travel , Trucks , Utah , Valves , Vehicles , Vents , Wheels , Pedal travel , Wheel cylinder temperature , Brake fade , Air hydraulic cylinder , Master cylinder , Polyglycols , One way valve vent
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