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Brake Flushing:
An operation where the brake system is flushed with alcohol or brake fluid to remove water, dirt and other contaminants. Fluid is placed in the master cylinder and forced through the lines and wheel cylinders, exiting at the cylinder-bleed screws.Barometric Pressure:
The pressure exerted by the weight of the earth's atmosphere, equal to one bar, 100 kilopascals, or 14.7 psi (often rounded off to 15 psi) at sea level. Barometric pressure changes with the weather and with altitude. Since it affects the density of the air entering the engine and ultimately the air/fuel ratio, some computerized emissions control systems use a barometric pressure sensor so that the spark advance and EGR flow can be regulated to control emissions more precisely.