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Bleeder Jar

A glass or transparent plastic container used to detect the escape of air while bleeding brakes.

Bleeder Screw

A small, hollow screw or valve found at drum-brake wheel cylinders, in disc brake calipers, and adjacent to the outlet ports of some master cylinders. It is opened to release pressure and to bleed air and fluid from the hydraulic system.

Bleeding

1. The slow releasing of pressure in the air-conditioning system by recovering some of its liquid or gas. 2. The act of removing air from a hydraulic brake system. 3. A small leaker. 4. When one paint color shows through another.

Bleeding Sequence

The order of bleeding brake systems or other components.

Blend Air

The control of air quality by blending heated and cooled air to the desired temperature.

Blend Air Door

A door in the duct system that controls temperature by mixing heated and cooled air in correct proportions to achieve the desired effect.

Blind Spot

An area beside a vehicle or a trailer that cannot be seen using the vehicle's rearview and outside mirrors.

Blinky

The timing light at the end of a quarter-mile strip.

Blip

A quick punch to the throttle to rev the engine momentarily.

Blistering

1. Tire tread separating from the carcass due to high heat. 2. Bubbles or pinholes that appear in paint. 3. To go exceptionally fast, as in a blistering pace.

Blistering Pace

To go exceptionally fast.

Bloc-Chek

A device to detect the leakage of exhaust gas into the cooling system.

Block

Main casting of the engine that contains the cylinders; often made of cast iron or aluminum.

Block

A spacer that goes between a truck's axle housing and leaf spring to lift the suspension. Blocks can provide a 2- or 4-inch lift, typically, but they should not be used to lift a front suspension, and they should not be stacked. The use of blocks typicall does not reduce a vehicle's hauling or towing capacity. See also engine block.

Block Check

A device used to detect oil or gasoline in the cooling system.

Block Learn

PCM memory that adjusts the air/fuel ratio on a semi-permanent basis. Now known as long term fuel trim.

Block Valve

A type of thermostatic expansion valve utilizing an internal sensing bulb.

Blow

A performance term for the failure of a transmission or engine, such as "blow the engine."

Blow Off

To defeat a competitor.

Blow Off The Doors

To defeat a competitor by a wide margin.