negative caster causes

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  • 16 Jan 2021

negative caster causes

If you had a negative angle, the steering wheel would turn to decrease the turn radius until it hit lock (a hardover condition). Under no circumstances am I aware of should you have negative caster (tilted forward). Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. A control arm or some other part of the suspension could have been damaged in an accident, going over a pothole, or just from uneven wear on your tires. 49 - What can be caused by excessive negative caster? 49 - Describe the difference between toe-in and... Ch. If you had zero angle, the car would maintain the turn indefinitely. 49 - What is scrub radius and why is it important? Over time, this can cause them to bend and cause the negative camber situation. Ch. The unintentional cause of negative camber is related to the suspension. Setting a negative caster was the only way to make the rotation of steering wheel easier in those cars. You should have positive caster. The more caster you have (say 8 degrees); the more quickly the steering wheel will return to center when coming out of a turn. What to Inspect. With less caster (say 4 degrees) it will not return to center as quickly. This can cause funky handling. Vehicles with SLA suspensions use the upper and lower ball joints to create the angle, and those with struts use the center of the upper strut mount and the lower ball joint as the angle. Furthermore, negative camber causes a force to be applied to the wheels that we call ‘camber-thrust'. Uneven caster side-to-side: Too much cross-camber can cause a vehicle to pull to one side. This force wants to push the wheels toward the centre of the car. (CENTER) When a suspension does not gain camber during deflection, this causes a severe positive camber condition when the car leans during cornering. Who is correct? Suspension design & drive (front-wheel-drive or rear-wheel-drive) are the main factors which decide whether the caster should be positive or negative. (LEFT) Negative camber: The tops of the wheels are closer together than the bottoms. 49 - In what direction must the bottom of a tire and... Ch. If the caster is not equal on both sides of the vehicle, it will pull to the side with the least amount or most negative caster. Ch. Wheel Alignment: Caster Angle. To actually answer your … Technician B says that excessive negative caster causes front-wheel shimmy. Seen from ride height, more and more negative camber will occur during the compression of the suspension (depending on the wheel geometry). That is due to the process required to initiate a stopping routine. Technically, the negative caster is the opposite of the positive one. Ch. 49 - Describe thrust angle and why it is important foi... Ch. Positive vs Negative Caster. 49 - What can cause incorrect toe-out-on-turns? A negative camber can cause your brakes to lock too. The caster angle causes this. Manufacturers use this adjustment to compensate for crowned roads. Mechanical Engineering Automotive Technology: A Systems Approach (MindTap Course List) While discussing front-wheel caster: Technician A says that excessive positive caster increases the steering effort and causes harsh riding. Source: Hagerty. Technician A only Technician B only Both A and B … Causes: A bent strut or spindle, a collapsed control arm bushing, worn steering and/or suspension components or a shifted cross-member or engine cradle. An out of specification caster angle is typically due to a broken or bent part, possibly caused by a collision. Most vehicles have positive caster. If you are operating a negative camber, then the angle can cause the brakes to lock up on some vehicle setups. Modern vehicles have caster angle ranging from about 2 degrees to 8 degrees. 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