The diameter of a circle scribed through the bolt hole centers of a wheel. The diameter of the opening in a disc which allows for protrusion of the axle hub. A small cylinder located at each wheel brake that uses brake fluid to exert hydraulic pressure, which forces the brake shoes against the brake drums and stops the vehicle. That part of the hydraulic brake system that receives pressure from the master cylinder and in turn applies the brake shoes to the drums. Also see brake backing plate .
Traction is lost and regained in rapid cycles after power is applied to the rear wheels.
It indicates a need for different tires, better shock absorbers , better springs, better axle control, different driving technique, or all of the above. They are marked in fractions of an ounce or in grams. The distance between the center of the front wheels and the center of the rear wheels. Arms are usually of spring material and have small wheels attached to the ends that contact the ground. An injury to the head and neck of an occupant of a vehicle.