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9-8
5. BRAKE SYSTEM
Trouble symptom
1. Insufficient braking force
2. Brake acting unevenly.
(Machine is turned to one
side during braking.)
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Hydraulic system leaks oil.
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Hydraulic system leaks air.
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Lining surface soiled with water or oil.
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Lining surface roughened or in poor
contact with drum.
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Lining worn.
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Brake valve or wheel cylinder mal-
functioning.
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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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Lining surface soiled with water or oil.
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Earth intruding into brake drum.
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Lining surface roughened.
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Lining in poor contact with drum.
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Lining worn.
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Brake drum worn or damaged
(distortion or rusting).
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Wheel cylinder malfunctioning.
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Brake shoe poorly sliding.
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Back plate mounting bolt loose.
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Back plate deformed.
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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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Clean or replace.
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Clean.
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Repair by polishing or replace.
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Repair by polishing.
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Replace.
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Repair or replace.
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Repair or replace.
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Adjust.
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Retighten or replace.
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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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Clean or replace.
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Repair by polishing or replace.
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Replace.
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Repair or replace.
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Clean.
P
P
robable cause
Remedy
3. Brake trailing.
4. Brake chirps
5. Brake squeaks
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Pedal has no play.
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Brake shoe poorly sliding.
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Wheel cylinder mal-functioning.
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Piston cup faulty.
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Return spring fatigued or bent.
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Parking brake fails to return or out of
adjustment.
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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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Brake trailing.
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Piston fails to return.
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Lining worn.
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Lining surface roughened.
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Lining surface roughened.
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Lining worn.
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Poor shoe to lining contact.
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Excessively large friction between
shoe and back plate.
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Foreign matter on drum sliding surfa-
ce.
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Drum sliding surface damaged or di-
storted.
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Brake shoe deformed or poorly insta-
lled.
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Back plate mounting bolt loosening.
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Worn anchor or other contact portion.
Â
Adjust.
Â
Adjust.
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Repair or replace.
Â
Replace.
Â
Replace.
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Repair or adjust.
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Clean.
Â
Clean.
Â
Adjust or replace.
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See 3. Brake trailing.
Â
Replace.
Â
Replace.
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Repair by polishing or replace.
Â
Repair by polishing or replace.
Â
Replace.
Â
Replace.
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Clean and apply brake grease.
Â
Clean
Â
Replace.
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Replace or repair.
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Retighten.
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Replace.