as 114 lbflin2, and after 1 hr, the pressure was 102 lbflin2. The pressured reduction may be attributed to an air leak through the check valve or past the piston ring gasket asa result of wear. Laboratory mechanical tests were also performed on the rope brake in the Mine Electrical Systems Division laboratories located at. The Pittsburgh Safety and Health Technology Center. The testing was performed on the smaller Bode rope brake model 200. The rope brake system was positioned outside the laboratory building under an awning that allowed the brake system to be exposed to the outside air temperature and humidity but was protected from direct contact with the rain and snow. The rope brake was activated remotely puter control. puter was programmed to apply and then release the rope brake every
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