Auto Service Professional

JUN 2018

Magazine for the auto service professional

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38 A S P J u n e 2 018 C h a s s i s S e r v i c e autonomous braking, long range radar, infrared, cameras, etc., may need to be re-set, especially if the vehicle has been involved in a collision due to sensor alignment angles being misaligned. Wheel alignments are becoming more complex due to these additional features. e OEMs pro- vide set procedures for vehicles that feature these systems. Air suspension concerns Problems with air suspension systems present a range of unique issues. e engineers at Arnott were kind enough to provide the following infor- mation. Air suspensions are found on many luxury cars, trucks and SUVs. Air suspension serves the same purpose as a standard coil spring suspen- sion system but instead of using metal springs — it uses inflatable air springs filled with com- pressed air to level the vehicle. Many consumers miss the early warning signs of an air suspension issue — unfortunately these problems only get worse, and more expen- sive — over time. e main signs of air suspension problems include: e dashboard warning light: One of the obvious signs of an air suspension problem is when a dashboard warning light comes on. Even if the light doesn't stay on, the vehicle should be checked. Suspension sagging: One of the first signs of an air suspension problem is when a car sags in a corner or entire side. Typically this is due to the rubber air spring developing tiny cracks or holes because of dry rot or road debris. If a customer notes that their vehicle drops in height overnight or aer they park, they most likely have leaks in their air spring or strut. Air suspension compressor constantly work- ing: If there is damage to the air springs then the compressor will constantly be pumping air to keep the air bladders inflated. If the compressor is constantly running, the system should be exam- ined as soon as possible. Compressor not working at all: e air sus- pension system cannot function without the compressor. If the compressor does not come on at all, that may be a sign that it was overworked and has burned out or it could be as simple as a fuse or relay problem. Compressor making noises e owner may also notice abnormal noises during compres- sor operation such as loud clicking, whining or grinding. is could be a sign that the compres- sor has been overworked or there could be excess moisture in the system because the compressor's dryer is saturated. Once the compressor has been replaced the rest of the system including the air springs and struts should be tested. Other suspension issues also may apply to air suspension including: • e vehicle bottoms out over bumps or rides roughly. • It nose dives when stopping. • e vehicle pulls to one side or steering is difficult. This ball joint lost its lubrication to the point where the stud ball bounced and battered the housing to the point of fracture and the ball tried to pound its way out. Worn and failed plastic ball joint liners in inexpensive ball joints prevent the stud ball from maintaining its center pivot axis and greatly reduces the joint's lubricity. Upgrading to quality aftermarket joints will avoid this. PHOTO COURTESY FEDERAL-MOGUL MOTORPARTS PHOTO COURTESY FEDERAL-MOGUL MOTORPARTS

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