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9-8
5. BRAKE SYSTEM
Trouble symptom
1. Insufficient braking force
2. Brake acting unevenly.
(Truck is turned to one
side during braking.)
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Hydraulic system leaks oil.
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Hydraulic system sucks air.
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Disk worn.
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Brake valve malfunctioning
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Hydraulic system clogged
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Tires unequally inflated.
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Brake out of adjustment.
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Disk surface roughened.
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Wheel bearing out of adjustment.
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Hydraulic system clogged.
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Adjust tire pressure.
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Adjust.
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Repair by polishing or replace.
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Adjust or replace.
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Clean.
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Repair and add oil.
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Bleed air.
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Replace
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Repair or replace.
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Clean.
Probable cause
Remedy
3. Brake trailing.
4. Overheat
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Pedal has no play.
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Piston cup faulty.
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Brake valve return port clogged.
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Hydraulic system clogged.
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Wheel bearing out of adjustment.
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Cooling oil insufficient.
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Cooling system malfunctioning.
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Excessive braking.
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Adjust.
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Replace.
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Clean.
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Clean.
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Adjust or replace.
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Add.
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Repair or replace.
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Use engine brake.