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4-7
Problem
Brake rapping
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Drum sliding surface roughened.
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Drum eccentric or excessively distort-
ed.
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Lining surface roughened.
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Repair by polishing or replace.
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Replace.
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Repair by polishing or replace.
c
c
ause
Remedy
Large pedal stroke
Pedal dragging.
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Brake out of adjustment.
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Hydraulic line sucking air.
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Oil leaks from hydraulic line, or lack
of oil.
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Lining worn.
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Shoe tilting or does not return compl-
etely.
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Lining in poor contact with brake
drum.
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Twisted push rod caused by improp-
erly fitted brake valve.
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Brake valve seal faulty.
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Flow control valve orifice clogged.
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Adjust.
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Bleed air.
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Check and repair or add oil.
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Replace.
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Repair.
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Repair.
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Adjust.
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Replace.
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Clean or replace.
Brake squeaks
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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.
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Lining poor contact with drum.
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Anti-rattle spring poorly installed.
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Repair by polishing or replace.
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Replace.
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Replace.
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Clean and apply brake grease.
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Clean
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Replace.
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Replace or repair.
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Retighten.
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Replace.
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Repair or replace.
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Repair or replace.