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