76
BRAKE
6
Troubleshooting
6- 4.
6-4-1. Brake - troubleshooting
No.
Symptom
Possible cause
Solution
1
Ineffective
braking
force
1. Oil leakage from piston cup of master cylinder
Replace
2. Air is mixed into brake oil due to shortage of oil
Refill oil and bleed air
3. Oil leakage from cup of wheel cylinder
Replace
4. Air is mixed in brake pipings
Bleed air
5. Wear of linings or uneven contact with brake drum
Inspect and replace
6. Adhesion of oil on lining or brake drum
Clean or replace
7. Out of adjustment of brake
Adjust
2
Brake
squeaks
1. Lining is grazed or adhesion of oil on lining
Repair or replace
2. Backing plate is transformed or fitting bolts are loose
Inspect and retighten
3. Brake shoe is transformed or badly mounted
Replair or replace
4. Lining is badly worn
Relpace
5. Wheel bearing is loosen.
Inspect and retighten
6. Anchor pin of backing plate is worn or transformed
Replace
3
Braking
only at one
side
1. Unequal air pressure of tires at R.H and L.H sides
Adjust to appropriate
pressure
2. Out of adjustment of brake
Adjust
3. Lining is grazed or unequally contacted with brake drum.
Repair or replace
4. Lining is worn.
Replace
5. Wheel cylinder is malfunctioned.
Replace
6. Backing plate is transformed or badly mounted.
Replace or retighten
7. Brake drum is eccentrically machined or mounted.
Repair or replace
8. Brake piping is clogged.
Clean or replace
9. Wheel bearing is loose.
Inspect and adjust
4
Brake
drags
1. No play of brake pedal
Adjust
2. Wheel cylinder is malfunctioned.
Replace
3. Master cylinder is malfunctioned or hole for oil flow is
clogged.
Repair or replace
4. Return spring in brake ass'y is damaged.
Replace
5. Parking brake is not fully released or not adjusted
correctly
Adjust
6. Brake piping is clogged.
Clean or replace
7. Wheel bearing is not mounted correctly.
Adjust
5
Pedal
stroke is
too large
1. Out of adjustment of brake
Adjust
2. Air is mixed in brake pipes.
Bleed
3. Oil leakage from brake pipings or shortage of brake
oil.
Fill brake oil and
bleed air
4. Bad adjustment of brake pedal
Adjust
6
Ineffective
parking
brake
1. Bad installation of parking cable
Adjust
2. Wear of brake linings
Replace
3. Out of adjustment of brake
Adjust
4. Out of adjustment of brake lever
Adjust
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