Auto Service Professional

APR 2018

Magazine for the auto service professional

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45 | ASP April 2018 Circle 121 on Reader Service Card PERFORMANCE SENSORS R D A Y E V E N I N G P O S T Single SKU combines 314.9, 315 & 433 MHz Over 96% coverage Aluminum clamp-in & rubber snap-in stem options OE quality from the trusted OE market leader Lighten Up Your TPMS Inventory! Check out our NEW website: SchraderSensors.com! I n n o v a t i o n D r i v e n S i n c e 1 8 4 4 Tire Valves l Tire Gauges Technical movement from its proper operating plane. Wheel bearing pre-load (looseness of the bearing), rotor thickness variation, rotor runout, hub runout, combined rotor and hub runout and improper tightening of the wheel assembly can each play a part in creating a pedal pulsation. In addition to runout problems, brake pedal pulsation may be caused by variations in brake rotor thickness. Brake rotor thick- ness variation (not to be confused with rotor runout) causes brake pedal pulsation to occur due to changes in braking force as thick/thin portions of the rotor contact the brake pads. In order to inspect the rotor for thickness variation, measure the rotor with an outside micrometer in eight equally spaced locations. e thickness measurements should be taken approximately 0.40 in. (10 mm) from the rotor's outer edge. Original equipment or aftermarket brake rotors may feature slots that are intended to help clean the pads and evacuate pressure gases. Especially for emergency vehicle applications such as police vehicles, when rotors are replaced, rotors and pads must provide the same type of performance in order to maintain superior braking.

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