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A strut is a structural piece designed to resist pressure in the
direction of its length. On typical "MacPherson Strut" use, the
shock absorber is built into the strut. Most shock absorber struts
are hydraulic units. Some MacPherson systems used on Ford vehicles
are equipped with low-pressure, gas-filled shock struts. They are
nonadjustable and nonrefillable. Like the hydraulic shock struts,
faulty units must be replaced as an assembly. Another similar
front suspension system is called the "hydraulic shock strut." This
strut serves as a shock absorber and replaces the upper control
arm. The coil spring, however, is located between the lower control
arm and the body structure instead of being mounted directly on the
strut.
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