Modern Tire Dealer

FEB 2019

Magazine for the professional tire industry

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M T D F e b r u a r y 2 0 1 9 30 B r a k e S e r v i c e W hen it comes to di- agnosing brake, ride control and tire wear issues, a new approach to the tried-and-true steps for inspecting vehicles can help boost service sales and reduce comebacks. For details, Modern Tire Dealer turned to Joe Bacarella from Tenneco Inc., manufacturer of Monroe shocks and other aermarket products, and Dann Ingebritson from Brake Parts Inc LLC (BPI), maker of Raybestos brand brakes. THINK DYNAMICALLY Since most inspections are performed when a vehicle is on a hoist or alignment rack, technicians fall into a pattern of thinking statically when performing inspections or alignments, according to Bacarella, who is Tenneco's manager of training. e tendency is to think statically when diagnosing a ride, tire or braking concern, too. "e most accurate brake, tire wear and ride control diagnosis comes from technicians who think dynamically. In other words, they are thinking about what's happening when the vehicle, and specifically the suspension, is in motion," says Bacarella. "If they are looking at brakes statically, and not thinking about what's happening to the suspension when they are applying the brakes, they are not going to resolve the brake issue." For example, technicians who think statically will recommend front brake service only for a vehicle with worn front brake pads and good rear pads. But technicians who think dynamically look at the vehicle's repair history. ey might find the customer has gone through front brake pads every 10,000 or 15,000 miles on a vehicle with 60,000 miles and the original rear brake pads. Technicians who think dynamically consider what might cause brake pads to wear when the vehicle is in motion. "For example, if there's a lot of weight transfer to the front wheels, it could cause more loading on the front brakes and cause them to wear out prematurely," says Bacarella. "If a technician inspects both front and rear ride control, he or she may discover the ride control components are worn, allowing the weight to transfer very quickly when the brakes are applied." Approaching the inspection with a dynamic mind-set also can prevent misdi- agnosing the source of a customer's complaint. "Sometimes a customer will come in aer a brake service and say the brakes feel grabby," says Bacarella. "A tech may service the brakes again and try to resolve issues that could lead to grabby brakes. But when the tech drives the vehicle he or she may find it's actually a weight transfer issue." "Every time they brake the front end might dive very quickly. The consumer thinks it's caused by grabby brakes when worn ride control is causing the weight to shi very quickly." TIRE CUPPING ISSUES inking dynamically helps determine the source of tire cupping issues, too. "Techs can align a vehicle and get everything perfect with the vehicle sitting statically, but if they are still experiencing an odd tire wear pat- tern, they need to think about what could cause that same type of wear even though all the alignment adjustments are fine," says Bacarella. In order to resolve the customer's concern with the first repair, technicians need to focus on what is happening as the suspension moves through its travel. "Not just vertically, but as the steering turns le to right. at not only means dynamic toe changes, but also other dynamic alignment changes and how the ride control slows all those different things down." RIDE CONTROL AND TIRE VIBRATION Bacarella notes that worn ride control com- ponents can be a source of vibration issues with low-profile tires. "If technicians do not have success eliminating a vibration through road force variation balancing, they might assume it's coming from elsewhere in the vehicle, like the engine or the drivetrain. In reality the resolution could be to replace worn or low-cost replacement shocks and struts with premium units designed for the challenges presented by low-profile tires." e Monroe OE-Spectrum line of shocks and struts is engineered with the latest original equipment valving to help eliminate repetitive vibrations that are difficult to balance out of low-profile tires, according to Bacarella. e vibrations in properly balanced low- profile tires are due to the combination of Ann Neal By SERVICE BRAKES, RIDE CONTROL AND TIRES TOGETHER TO REDUCE COMEBACKS

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