Auto Service Professional

JUN 2018

Magazine for the auto service professional

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46 A S P J u n e 2 018 C h a s s i s S e r v i c e Severely worn shock absorbers (indepen- dent shocks or strut dampers) prevent con- trolled vertical wheel travel, reducing correct tire-to-road surface contact pressure, result- ing in a "floating" sensation at highway speed. In combination with speed-related vehicle air resistance, this can give the driver a feeling of a light, "wandering" condition. Worn shocks/ dampers will allow over-travel of the suspen- sion, allowing excessive body lean in both lat- eral (side to side) and longitudinal (front/rear) planes. e reduction of damping and spring harmonic control leads to not only directional wander and body lean during cornering but nose-dive during deceleration and braking, as well as noticeable wheel hop, since a failed shock is not able to control suspension spring oscillation. While signs of hydraulic oil leakage are indications of wear, internal pistons and seals may be worn with no observed fluid leaks. Since poorly performing or worn-out shocks/ struts don't control the suspension properly, this creates a domino effect by placing greater loads and stress on other suspension parts such as con- trol arm bushings, springs, anti-roll bar bush- ings, lateral links, etc. Worn steering system components, such as tie rod ends, drag links, steering gears, rack mount bushings, worn or loose pitman arms or A wireless transmitter is attached to a control arm to monitor suspected bushing wear. Here the transmitter is secured with a Velcro strap. Each transmitter is numbered, and corresponds to the button numbers on the controller. By activating a selected button, you're able to monitor the matching number. The row of LED lights provides an intensity level reference.

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