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. With less caster (say 4 degrees) it will not return to center as quickly. To actually answer your … 49 - What can cause incorrect toe-out-on-turns? Ch. Under no circumstances am I aware of should you have negative caster (tilted forward). 49 - What is scrub radius and why is it important? (LEFT) Negative camber: The tops of the wheels are closer together than the bottoms. What to Inspect. That is due to the process required to initiate a stopping routine. Seen from ride height, more and more negative camber will occur during the compression of the suspension (depending on the wheel geometry). (CENTER) When a suspension does not gain camber during deflection, this causes a severe positive camber condition when the car leans during cornering. You should have positive caster. Caster is the forward or backward tilt of the steering axis viewed from the side of the vehicle. Uneven caster side-to-side: Too much cross-camber can cause a vehicle to pull to one side. An out of specification caster angle is typically due to a broken or bent part, possibly caused by a collision. Turning corners become difficult with a negative caster. 49 - Describe the difference between toe-in and... Ch. Positive vs Negative Caster. Technician B says that excessive negative caster causes front-wheel shimmy. The caster angle causes this. 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. Manufacturers use this adjustment to compensate for crowned roads. Technician A only Technician B only Both A and B … This force wants to push the wheels toward the centre of the car. Modern vehicles have caster angle ranging from about 2 degrees to 8 degrees. 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. This can cause funky handling. 49 - What can be caused by excessive negative caster? Ch. Most vehicles have positive caster. Furthermore, negative camber causes a force to be applied to the wheels that we call ‘camber-thrust'. Due to this negative caster, the steering wheel in older vehicles often feels too light, and it becomes hard to keep the vehicle on track during turning a corner. Who is correct? The unintentional cause of negative camber is related to the suspension. If you are operating a negative camber, then the angle can cause the brakes to lock up on some vehicle setups. Over time, this can cause them to bend and cause the negative camber situation. A negative camber can cause your brakes to lock too. Setting a negative caster was the only way to make the rotation of steering wheel easier in those cars. 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. If you had a negative angle, the steering wheel would turn to decrease the turn radius until it hit lock (a hardover condition). Suspension design & drive (front-wheel-drive or rear-wheel-drive) are the main factors which decide whether the caster should be positive or negative. Ch. Source: Hagerty. Technically, the negative caster is the opposite of the positive one. The more caster you have (say 8 degrees); the more quickly the steering wheel will return to center when coming out of a turn. 49 - In what direction must the bottom of a tire and... Ch. 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