TM 9--2350--292--20--10177 00--1LOW BRAKE PRESSURE WARNING LIGHT COMES ON AND WARNINGHORN SOUNDS.0177 00THIS WORK PACKAGE COVERS:Low Brake Pressure Warning Light Comes On And Warning Horn Sounds.INITIAL SETUP:Tools and Special ToolsGeneral mechanic’s tool kit (item 1, WP 0717 00)Multimeter (item 84, WP 0717 00)Reducer (item 95, WP 0716 00)Plug, 1/2 inch (2) (item 69, WP 0716 00)0--4000 psi testing gauge assembly (item 82,WP 0717 00)Equipment ConditionsVehicle MASTER switch OFF (TM 9--2350--292--10)Subfloor plate 13 removed (WP 0454 00)Personnel RequiredTwoDid pressure gauge 500 psi (old configuration) or 550psi (new configuration with brake modulation?1. Pump brake pedal several times(TM 9--2350--292--10).2. Read brake pressure gauge on power boostmanifold.3. Turn vehicle MASTER switch OFF(TM 9--2350--292--10).noyesnoyesABCONTINUED ON NEXT PAGE1. Disconnect harness 4W155 lead 48 from lowbrake pressure warning switch (WP 0328 00).2. Disconnect harness 2W601 lead 591 from lowbrake pressure warning switch (WP 0291 00).3. Place one multimeter lead in low brakepressure warning switch lead 48 connector andplace other multimeter lead in low brakepressure warning switch lead 591. Check forcontinuity.Is continuity present?WARNINGRemove rings, bracelets, wristwatches,and neck chains before working on anyvehicle. Jewelry can catch on equip-ment and cause injury, or may shortacross an electrical circuit and causesevere burns or electrical shock.Go to Step F.Replace low brake pressurewarning switch(WP 0378 00 or WP 0379 00).Verify fault is corrected.FORWARD
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