Auto Service Professional

DEC 2018

Magazine for the auto service professional

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36 A S P D e c e m b e r 2 018 REPAIR I By Edwin Hazzard In today's world of automotive repair we're faced with dealing with a broad range of dif- ferent types of systems in modern day ve- hicles that reach our service bays. Many of those systems have been there for many years but have evolved into a much more complex and highly sophisticated part of your routine repair practices. A number of your so- called routine diagnostic repairs have changed considerably over the years. Anti-lock braking systems (ABS) have been featured in vehicles for more than 50 years. ey were, in fact, used in the aviation industry in the early 1950s. e braking system on an automobile is per- haps the most important system on the vehicle when it comes to safety. Let's face it, its job is to stop a 4,000 pound mass of metal and plastic in a reasonable amount of time and to prevent any bodily harm to its occupants and bystanders in the vicinity. With the components used in the early sys- tems like brake drums, brake shoes, disc pads and rotors coupled to a series of hydraulic lines acting off of hydraulic pressure, which is then operated by the reflexes of the driver to ap- ply these components in a timely manner, they worked very well for many years. Even in to- day's vehicles, these same components are used to stop the vehicle. But with the advent of ABS, these components are getting help from an out- side source. e biggest change is actually in the help that the ABS systems will contribute toward the aid that the driver of the vehicle will receive. Let's take a look at some of these systems and learn how to service and diagnose the problems that they can present. Today's ABS e anti-lock braking system (ABS) is the same as our conventional braking system but with some extra components added and a lot of electrical add-ons. Since the ABS has received an array of electrical parts, it's only fitting that these systems need to be monitored and some decisions need to be made by other factors besides the human driver. e component responsible is the control module or specifically the electronic brake con- trol module (EBCM). See Figure 1. e EBCM is Breaking down anti-lock braking systems A B S ŠISTOCKPHOTO.COM/TANYA-STOCK

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