. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . Fig. 84. Part Sectional View of Automatic Slack-Adjuster the piston should be kept as nearly constant as possible. Thegreater the stroke, the less the pressure. The stroke of the pistonshould be kept at about 8 inches. As the brake shoes and variousconnections wear, the stroke of the piston is increased, and the pres- 102 AIR BRAKES. Fig. 85. Outside Equalized Driver-Brake for Locomotives

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