To safely slow down or stop a moving vehicle, brake cylinder components should move freely, rapidly and smoothly, regardless of the ambient temperature. Materials and Consistancy in Brake Cylinder LubricantsĪAR M-914 paragraph 2.3.1 – Apparent Viscosity at -40☏ (American Association of Railroads Specification M-914 Brake Cylinder Lubricant Apparent Viscosity) Reported are the initial, final and change in penetration. The resulting grease is again subject to a worked penetration. The grease is then placed in the roll stability apparatus and rolled for 96 hours at 82☌. The original ½ scale worked penetration is determined for the test grease. ![]() Smaller changes in penetration values indicate a better roll stability. ![]() This test uses the ASTM D1831 roll stability apparatus to determine changes in penetration numbers caused by combined heating with mechanical stresses. If the grease thins from heat generated by forces (such as those caused by wheel/rail irregularities, roll resonance and rigid body motions), it may compromise grease functionality. Railroads rely on axel boxes, bearings and other components to function, requiring a lubricating grease of proper consistency. ![]() AAR-942 Elevated Temperature Roll Stability Test
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