| A | B |
|---|
| aerate | The tendency to create air bubbles in a fluid. |
| bleeding | The process of removing air from a hydraulic braking system |
| brake hose | A flexible section of the brake lines between the body and suspension that allows for steering and suspension movement |
| brake lines | Made of seamless, double-walled steel and able to transmit over 1000 psi (6895 kPa) of hydraulic pressure through the hydraulic brake system. |
| compensating port | Connects the brake fluid reservoir to the master cylinder bore when the piston is fully retracted, allowing for expansion and contraction of the brake fluid |
| hydroscopic | A property of a substance or liquid that causes it to attract and absorb moisture (water), as a sponge absorbs water. Brake fluid absorbs water out of the air; thus it is hygroscopic. |
| inlet port | Connects the brake fluid reservoir to the master cylinder bore when the piston is fully retracted, allowing for expansion and contraction of the brake fluid. |
| International Standards Organization (ISO) flare method | A method for joining brake lines, also called a bubble flare. Created by flaring the line slightly out and then back in, leaving the line bubbled near the end. inverted double flare A method for j |
| inverted double flare | A method for joining brake lines that forms a secure, leakproof connection. |
| weight transfer | Weight transfer from one set of wheels to the other set of wheels during braking, acceleration, or cornering. |
| metering valve | A valve used on vehicles equipped with older rear drum/front disc brakes to delay application of the front disc brakes until the rear drum brakes are applied. Located in line with the front disc brakes |
| outlet port | The port leaving a cylinder or pump |
| Pascal's law | The law of physics that states that pressure applied to a fluid in one part of a closed system will be transmitted equally to all other areas of the system. |
| poppet valve | A valve that controls the flow of brake fluid at usually preset pressures |
| pressure differential valve | A valve that monitors any pressure difference between the two separate hydraulic brake circuits; it usually contains a switch to turn on the brake warning light when there is a pressure difference. |
| primary cup | A seal that holds pressure in the master cylinder when force is applied to the piston |
| primary piston | A brake piston in the master cylinder moved directly by the pushrod or the power booster; it generates hydraulic pressure to move the secondary piston. |
| proportioning valves | Valves used mostly on older vehicles equipped with rear drum brakes to reduce rear wheel hydraulic brake pressure under hard braking or light loads. Located in line with the rear brakes. |
| quick take-up master cylinders | Cylinders used on disc brake systems that are equipped with low-drag brake calipers to quickly move the brake pads into contact with the brake rotors. |
| quick take-up valve | A valve used to release excess pressure from the larger piston in a quick take-up master cylinder once the brake pads have contacted the brake rotors. |
| recuperation | Process by which brake fluid moves from the reservoir past the edges of the seal into the chamber in front of the piston. This prevents air from being drawn into the hydraulic system caused by low pressure when the brake pedal is released quickly. |
| residual pressure valve (residual check valve) | In drum brake systems, a valve that maintains pressure in the wheel cylinders slightly above atmospheric pressure so that air does not enter the system through the seals in the wheel cylinders. |
| secondary cup | A seal that prevents loss of fluid from the rear of each piston in the master cylinder. |
| secondary piston | A piston that is moved by hydraulic pressure generated by the primary piston in the master cylinder. |
| single-piston master cylinder | A master cylinder with a single piston that creates hydraulic pressure for all wheel units. If there is a leak in the system, there is a loss of pressure for all wheel units. |
| tandem master cylinder | A master cylinder that has two pistons that operate separate braking circuits, so if a leak develops in one circuit, the other circuit can still operate. |
