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Front Suspension Systems
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Coil Springs Coiled bar of spring type steel
Absorbs road shock & carries vehicle weight Linear- rate – equally spaced coils, have constant spring rating Variable-rate – tapered, unequal spacing, act differently under various loads Linear-rate springs have one load carrying value Variable rate spring change properties as more weight is added
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Torsion Bars Used in place of coil springs, usually 4WD trucks
Bar twists, resisting movement of lower control arm
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Ball Joints Pivot points allowing steering knuckle movement
Reduced steering effort Improved ride quality
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Ball Joint Construction
Ball & Socket design Ball seat is cushioned Spring loaded
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Load Carrying Ball Joints
Support vehicle weight
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Tension Loaded Ball Joint
Knuckle attached above lower control arm
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Compression Loaded Ball Joint
Knuckle attached under lower control arm
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Non-Load-Carrying Ball Joint
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Stabilizer Bar
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Strut Rod Connected to frame & lower control arm
Controls fore & aft movement of control arm May provide for caster adjustment
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I-Beam Suspension Solid axle connecting both front steering knuckles
Used on H.D. trucks
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Twin I-Beam
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Short & Long Arm Suspension
Provide for an independent suspension system Camber & caster angles remain fairly constant over bumps Arms connected to frame with rubber bushings
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Upper Control Arm Design
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Type 1 Design
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Type 2 Design
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S.A.L.A. Travel
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MacPherson Strut Suspension
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Modified Strut Design
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Modified Strut Design
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Double Wish Bone Design
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Independent Front 4WD
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Independent Front 4WD
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Solid Front 4WD
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