The SOP for a true Jacobs brake is 2 pedal switches. One on the clutch and one on the brake. if you just pull the shifter into neutral and let the jakes slow you to a stop. It SHOULD stall the engine. It should have disengaged when the clutch (whether you or the auto shift) was pressed. If you have a three pedal truck you should have your switches checked. A 2 pedal truck should be serviced by a dealer.
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