Auto Service Professional

APR 2018

Magazine for the auto service professional

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47 | ASP April 2018 Circle 122 on Reader Service Card RETAINING RING PLIERS NEW Part# 3595 www.LangTools.com • Convertible for use on internal/ external snap rings • Cushioned grip handles • Ergonomically designed switch allows user to change between internal and external with ease without separating the pliers • Packaged in a plastic blow molded case for protection and easy use 85 YEARS OF QUALITY TOOLS! Also available in a six piece kit or individually. Technical one hub has been replaced. is could cause the driver to feel ABS false activation when coming to a slow stop on dry pavement. False activation is usually described as a pulse in the brake pedal when not expected. e pulsation comes from the ABS valves cycling the supposedly locked up wheel. is is due to the difference in signal strength from the wheel speed sensors (WSS) side to side. e problem is usually associated with air gap difference or wiring and/or connector integrity. In many cases, removing the WSS from the other side, if possible, and cleaning mounting surface may repair problem. e rust buildup actually lifts the WSS from the bearing, increasing the air gap and weaken- ing the signal. Another possible issue is play in the bearing causing sine wave frequency change and or AC voltage variation. A cracked ABS tone ring (located on the outer CV joint, on the hub or inside the rotor, depending on design) can also cause the ABS warning light to illuminate due to small variations in the signal caused by the crack(s). Pad bedding/break-in As the pads mate with the rotor disc surface, and depending on the type of pad formula, a small amount of friction mate- rial is transferred to the disc surface, which If an ABS warning light illuminates and stays on, and your scanner indicates an issues at a specific location (right front wheel speed sensor, for example), remove the sensor and inspect for contaminants before replacing the sensor.

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