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Opel Frontera UBS. Manual - part 1100
POWER ASSISTED BRAKE SYSTEM 5C – 5
TROUBLESHOOTING
Condition
Possible Cause
Correction
Brake Pull
1. Tire inflation pressures unequal.
1. Adjust
2. Front wheel alignment incorrect.
2. Adjust
3. Unmatched tires on same axle.
3. Tire with approx. the same amount of
tread should be used on the same axle.
4. Restricted brake pipes or hoses.
4. Check for soft hoses and damaged
lines. Replace with new hoses and new
double-walled steel brake piping.
5. Water or oil on brake pads.
5. Clean or replace.
6. Brake pads hardened.
6. Replace.
7. Brake pads worn excessively.
7. Replace.
8. Brake rotor worn or scored.
8. Grind or replace.
9. Disc brake caliper malfunctioning.
9. Clean or replace.
10. Front hub bearing preload incorrect.
10. Adjust or replace.
11. Loose suspension parts.
11. Check all suspension mountings.
12. Loose calipers.
12. Check and tighten bolts to specifications.
Brake
1. Excessive lateral runout.
1. Check per instructions.
Roughness-or
If not within specifications, replace or
Chatter
machine the rotor.
(Pulsates)
2. Parallelism not within specifications.
2. Check per instructions.
If not within specifications, replace or
machine the rotor.
3. Wheel bearings not adjusted.
3. Adjust wheel bearings to correct
specifications.
4. Pad reversed (steel against iron).
4. Replace brake pad and machine rotor
to within specifications.
Excessive
1. Malfunctioning vacuum booster.
1. Check vacuum booster operation and
Pedal
repair, if necessary.
Effort
2. Partial system failure.
2. Check front and rear brake system for
failure and repair. Also, check brake
warning light. If a failed system is
found, the light should indicate a
failure.
3. Excessively worn pad.
3. Check and replace pads in sets.
4. Piston in caliper stuck or sluggish.
4. Remove caliper and rebuild.
5. Fading brakes due to incorrect pad.
5. Remove and replace with original
equipment pad or equivalent.
6. Vacuum leak to vacuum booster.
6. Check for ruptured or loose hose.
7. Check direction of check valve within
7. Correct vacuum hose direction.
vacuum hose.
8. Grease on the brake pads.
8. Replace or clean.
Excessive
1. Air in hydraulic circuit.
1. Bleed hydraulic circuit.
Brake Pedal
2. Level of brake fluid in resevoir too low.
2. Replenish brake fluid resevoir to
Travel
specified level and bleed hydraulic
circuit as necessary.
3. Master cylinder push rod clearance
3. Adjust.
excessive.
4. Leakage in hydraulic system.
4. Correct or replace defective parts.