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In MacPherson Struts, the shock absorber is built into the strut. The
strut consists of a shock absorber unit, a coil spring, an upper
pivot, and a lower clamp. The upper pivot mounts to the fenderwell.
The rest of the unit rotates when the steering is used. The lower
clamp secures the spindle and the strut together into a solid unit.
Most shock absorber struts are hydraulic units. Some use
low-pressure, gas to absorb energy. These are usually nonadjustable
and nonrefillable. Like the shock absorber, faulty units must be
replaced as an assembly.
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