air suspension SSANGYONG NEW ACTYON SPORTS 2012 Service Manual

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2. FRONT SUSPENSION (DOUBLE WISHBONE)
Advantage ▶
The advantage of a double wishbone suspension is that it is fairly easy to work out the effect
of moving each joint, so the kinematics of the suspension can be tuned easily and wheel
motion can be optimized.
It is also easy to work out the loads that different parts will be subjected to which allows more
optimized lightweight parts to be designed.
They also provide increasing negative camber gain all the way to full jounce travel unlike the
MacPherson strut which provides negative camber gain only at the beginning of jounce travel
and then reverses into positive camber gain at high jounce amounts. 1.
2.
3.
Disadvantage ▶
The disadvantage is that it is slightly more complex than other systems like a MacPherson strut.
Due to the increased number of components within the suspension setup it takes much longer to
service and is heavier than an equivalent MacPherson design. 1.
2. Double wishbone suspension is an independent suspension design using two (occasionally parallel)
wishbone-shaped arms to locate the wheel. Each wishbone or arm has two mounting points to the
chassis and one joint at the knuckle. The shock absorber and coil spring mount to the wishbones to
control vertical movement. Double wishbone designs allow the engineer to carefully control the
motion of the wheel throughout suspension travel, controlling such parameters as camber angle,
caster angle, toe pattern, roll center height, scrub radius, scuff and more.
Lower arm Upper arm Shock absorber Stabilizer

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Problem Possible Cause Action
Noise or vehicle
vibration when
appliedIncorrectly mounted back plate or caliper Repair
Loosened bolt of back plate or caliper Retighten
Uneven wear of brake disc Replace
Brake pad contamination Clean or replace
Sticking brake pad on contact surface Replace
Wear or hardening of brake pad Replace
Excessive clearance between caliper and pad Repair
Uneven contact of pad Repair
Lack of lubrication in sliding parts Lubricate
Improper operation of caliper Replace
Dust cover missing Repair
Loosened suspension mounting bolt Retighten
Pulls to one side
when brakingUnbalanced tire pressure between left and right Adjust
Poor contact of brake pad Repair
Oil or grease on brake pad Replace
Scratch, uneven wear, distortion of brake disc Replace
Improperly installed brake caliper Repair
Improper operation of auto adjuster Repair
Crack or distortion of brake pad Replace
Poor braking Oil leak or contamination Repair or replace
Air in brake line Bleed air
Improper operation of brake booster Repair
Poor contact of brake pad Repair
Oil or grease on brake pad Replace
Improper operation of auto adjuster Repair
Clogged brake line Repair
Improper operation of proportioning valve Repair
3. TROUBLESHOOTING

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3. TROUBLESHOOTING
Problem Possible Cause Action
Movements of steering
feels heavyUnregular wear or binding of steering ball joint
due to lack of lubrication or foreign material
insertionLubricate or replace
Damaged or defective steering gear Replace the steering
gear assembly
Incorrect steering pinion preload Adjust
Defective steering shaft joint Replace
leakage of steering fluid Repair or replace
Insuffcient steering fluid or air insertion Fill up fluid or bleed air
Defective steering oil pump Replace
Damaged or loosened pump drive belt Adjust or replace
Clogging of fluid line Repair or replace
Damaged wheel or tire Repair or replace
Defective suspension Repair or replace
Steering wheel pulls to
one sideDamaged steering linkage Replace
Damaged wheel or tire Repair or replace
Defective suspension Repair or replace
Defective brake system Repair or replace
Excessive free play of
steering wheelWorn steering gear Replace the steering
gear assembly
Worn or damaged steering ball joint Replace
Looseness of steering gear box Retighten
Poor returning of
steering wheelBroken or binding of steering ball joint Replace
Improper correct steering pinion preload Replace the steering
gear assembly
Damaged wheel or tire Repair or replace
Defective suspension Repair or replace

12-8
Problem Possible Cause Action
Excessive vibration of
steering wheel
(shimming)Broken steering linkage Replace
Looseness of steering gear box Retighten
Broken or binding of steering ball joint Replace
Worn or damaged front wheel bearing Replace
Damaged wheel or tire Repair or replace
Defective suspension Repair or replace
Abnormal noise from
steering systemLooseness of steering gear box Retighten
Defective steering gear Replace the gear
assembly
Interference between steering column and
partsRepair
Looseness of steering linkage Retighten
Loosened or damaged oil pump drive belt Adjust or replace
Looseness of oil pump bracket Replace
Looseness of oil pump Replace
Air insertion into system Bleed air
Defective oil pump Replace
Abnormal noise when
turning steering wheelLooseness of steering column Retighten
Worn or damaged steering shaft bearing Replace the steering
column
Looseness of intermediate shaft Retighten
Too heavy steering wheel Worn or damaged steering shaft bearing Replace the steering
column