. Railway and Locomotive Engineering. ervice posi-tion, the stop cock under the brake valvebeing open, it indicates a defectivetriple valve piston packing ring or adefective leather an<l ring on the con-trol piston. If the brake applies in service andbut a low brake cylinder pressure isobtained for a full service reductionit points to safety valve leakage, triplepiston packing ring leakage or an aux-iliary reservoir volume reduced by water. If the straight air brake will notapply the safety valve should be un-screwed before the reducing valve isfixed upon as the part at fault, as airissuing
. Railway and Locomotive Engineering. ervice posi-tion, the stop cock under the brake valvebeing open, it indicates a defectivetriple valve piston packing ring or adefective leather an<l ring on the con-trol piston. If the brake applies in service andbut a low brake cylinder pressure isobtained for a full service reductionit points to safety valve leakage, triplepiston packing ring leakage or an aux-iliary reservoir volume reduced by water. If the straight air brake will notapply the safety valve should be un-screwed before the reducing valve isfixed upon as the part at fault, as airissuing from the safety valve connec-tion would indicate some trouble inthe double check valve. If the automatic brake leaks off it in-dicates leakage in the control reservoir,in the control reservoir pipe or in theautomatic release valve of the straightair brake valve. It may possibly bedue to a leak in the retain pipe accom-panied by graduating or slide valveleakage. If after a light application of theautomatic brake, brake cylinder pres-. r:. coxTUoL \ai.\ i;. cut-out cocks being open, we wouldfirst ascertain whether the auxiliaryreservoir of the control valve ischarged, if so an opening should becreated between the control valve andthe double check valve. If no pressureissues when an application is attemptedit indicates a defective control \al\ pressure does escape from the open-ing it indicates a stuck iloul)le checkvalve. If the auxiliary reservoir portioncould not be cliarged a leaky reservoirshould first be looked for, then anobstructed feed or charging port, and ifnothing was found wrong it wouldpoint to an obstruction in the brakepipe. If more than 25 lbs. cylinder pres-sure was obtained for a 10 lb. brake])ipe reduction it would indicate leakageinto the control reservoir. If incorrect pressure is obtainedfrom an application of the straight airIirake it would indicate an improperlyadjusted reducing valve. If brake cylinder pressure falls afteran application of the straig
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