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besides features with standard brakes,ghis kind of brake has been added with air-reset function.as a dual safety structure brake,it co,p;etely solves the piston-reset problem.this makes it possible for the piston to reset its position 100% under abnormal condition there is residual air left in the brake chamber,oil pressure or the pipe line location is relatively higher.but two sets of pipelines are needed,it is much more stuitable for large and medium sized power statioms.