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| Axle Puller | A tool used to remove axles from their mounting points, typically in a vehicle's suspension system. It provides leverage to disengage the axle shaft from the differential or hub assembly. |
| Camber | The angle of the wheels relative to the vertical axis when viewed from the front or rear of the vehicle. Positive camber means the tops of the wheels tilt outward, negative camber means the tops tilt inward. Camber adjustment affects tire wear and vehicle handling characteristics. |
| Caster | The angle of the steering axis when viewed from the side of the vehicle. Positive caster means the steering axis tilts toward the rear of the vehicle, while negative caster tilts toward the front. Caster influences steering stability and returnability. |
| Geometric Centerline | An imaginary line drawn through the center of a vehicle, dividing it into equal left and right halves. It is used as a reference point for various suspension measurements and adjustments. |
| Grease Fitting | A small fitting attached to suspension components, such as ball joints or tie rod ends, that allows for the application of grease. Grease fittings are used to lubricate moving parts, reducing friction and wear. |
| Prealignment Inspection | A visual and physical inspection of suspension components performed before performing a wheel alignment. It ensures that all suspension parts are in good condition and properly adjusted to facilitate accurate alignment. |
| Ride Height | The distance between the vehicle's chassis and the ground when the vehicle is stationary and the suspension is fully uncompressed. Ride height affects vehicle stability, handling, and ground clearance. |
| Spring Compressors | Tools used to compress coil springs, allowing for their removal or installation without disassembling other suspension components. They are commonly used when replacing shocks, struts, or performing suspension repairs. |
| Strut Spring Compressor | A specific type of spring compressor designed to compress coil springs found on strut assemblies. It safely compresses the spring to facilitate the removal and installation of the strut components. |
| Thrust Line | An imaginary line drawn parallel to the vehicle's geometric centerline, extending through the rear wheels. It represents the direction in which the vehicle travels when moving straight ahead. Proper alignment ensures that the thrust line is aligned with the geometric centerline. |
| Toe | The angle formed by the longitudinal axis of the vehicle and the plane of the wheels when viewed from above. Toe can be positive (toe-in) or negative (toe-out) and affects tire wear and vehicle stability. |
| Visual Inspection | A method of examining suspension components for signs of wear, damage, or improper adjustment using the naked eye. Visual inspection helps identify potential issues before they lead to more significant problems or failures. |
