When the brake pedal is in the released position f ntznuntuq the pedal arm contacts the switch plunger holding it HNGERS in the off position When the brake pedal is depressed the spring loaded plunger extends with brake pedal movement until the switch is in the on position fig E 9 1 SWITCH Swltcn Mlustmom 1 Release brake pedal to its normal position On Cherokee Wagoneer and Truck models unhook ggggigrt RELEASED retaining fingers that secure wire harness plug to switch On all models disconnect wire at rear of switch 2 Adjust switch by turning in or out of mounting bracket Switch plunger should be in ON position and PEDAL POSITION activate stop lamps after 3 8 to 5 S inch of brake ggsxs TEgT3A L mm pedal travel Measure pedal travel from center of pedal pad 3 Connect wire or harness plug to switch Fll 9 l Slnylemp Swlletl Dpefellul Power Brakn Illagnasls Prncadura With engine stopped and tunsmsssncn m neutral apply brakes several times to deplete all vacuum reserve m the svstem Depress brake pedal hold light foot pressure on pedal and start engine ll V 9 pedal it tm action tt fen vacuum system ts not rum tend to tall ewnv under lout pressure and ucmnq less pressure will be required to hold pedal in I With enqine running and brakes 0N run to medtum spend and turn ull ngntttnn rmrner Sm Powe Uni Snug Dlagnqg dtately closing throttle This builds up vacuum Watt no less than ninety seconds then try U vacuum assnud qc wu or mma Il not vacuum assisted lor two Dt more app m appltcuttnns vacuum check valve is faulty nr there is a leak rn the vacuum Road Test Vehicle ll problem still S pm um stm a t 422B9