A brake control system and method that includes high-pressure fluid supply sources and cutoff devices for cutting off communication between a master cylinder and wheel cylinders during a control process. The ultrasonic inspection reference standard may have similar acoustic properties to prior art, porous, fiber-reinforced, composite reference standards, at lower manufacturing cost. 5 to 10 weight percent of at least one polypropylene wherein the combination of GPPS, HIPS, polypropylene and styrene block copolymer make up at least about 90 percent of the composition as well as a film made of the composition, an envelope window patch comprising the film, an envelope comprising the window patch, and a process for making the film. Such a dowel has the particular advantage of evenly distributing the pressure which acts upon the wall surface of a bore. A persistent query allows such a condition to be active at all times so that when one or more objects are created that satisfy the condition, those objects are identified as meeting the condition. A receptacle disposed above the base surrounds the cage, for collecting the shavings from sharpening a pencil.