TM 5-3805-262-203-17. PARKING BRAKE SYSTEM TROUBLESHOOTINGMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. PARKING BRAKE DOES NOT APPLY (WILL NOT HOLD).Step 1. Start and operate engine at 1000 rpm until AIR PRESS gage needleindicates in green area.Push in and momentarily hold in knob of parking brake valve.Release parking brake valve knob.Check that parking brake valve knob stays in and parking brake isr e l e a s e d .a. If parking brake valve knob does not stay in, parking brakevalve has leakage. Replace parking brake valve (page 7-12).If parking brake does not release, adjust parking brake linkage(page 7-17).b. If parking brake valve knob stayed in and parking brake releas-ed, go to step 2 below.Step 2. Shut off engine.Operate brake treadle and valve and declutch treadle and valve untilAIR PRESS gage needle is approximately 1/4 inch into red zone.Check that parking brake valve knob comes out and parking brake en-gages.a. If parking brake valve knob does not come out, replacebrake valve (page 7-12).If parking brake does not engage, adjust parking brake(page 7-17).If parking brake linkage is adjusted properly, replacebrake chamber (page 7-8).b. If parking brake valve knob came out and parking brakeremove parking brake drum and check brake linings for wear orcontamination (page 7-2). Replace if necessary.parking1 inks geparkingengaged,2. PARKING BRAKE WILL NOT RELEASE.Check adjustment of parking brake linkage.a. If parking brake linkage is not adjusted correctly, adjust (page7 - 1 7 ) .b. If parking brake linkage is adjusted properly, replace parkingbrake chamber (page 7-8).3-112
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