Mike's Workshop Manuals
: Service manuals for every vehicle
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Ford
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1991
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Bronco 4.9 Y, Standard, M5OD-R2
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Repair and Diagnosis
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Engine Performance
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Theory and Operation
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Engine Controls - Theory & Operation
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Input Devices
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Brake On-Off (Boo) Switch
Brake On-Off (Boo) Switch
The BOO switch is mounted on brake pedal. It signals deceleration for air/fuel ratio adjustment.