Abstract: A disc brake assembly of a vehicle has an actuator for actuating the disc brake and a housing that is positioned about the actuator. An element is provided for observing an identification mark positioned at a preselected location on the actuator adjacent a port of the housing. In the method of the invention, the brake of the vehicle is used and worn brake discs are replaced in response to the mark on the actuator being at a location spaced at least a preselected distance from the location of the mark prior to wear of the brake discs.

Abstract: The steering wheel together with other controls of an earth moving vehicle such as a motor grader are mounted on a pedestal which may be selectively tilted for optimum positioning for different operators and to enable a particular operator to sit or stand at his convenience. The pedestal is defined by links pivoted together in a configuration which maintains the steering wheel at a substantially constant inclination and which maintains the other controls at preferred positions relative to the steering wheel and is provided with latch means for locking and releasing the pedestal at a selected inclination with a minimum of effort and diversion of attention. The pedestal and controls are arranged to increase safety by obstructing forward pitching of the operator in the event of abrupt vehicle stoppage while providing for rapid escape from the operator's station at either side of the vehicle. .Iadd.