BRAKE SYSTEM COMPONENT MAINTENANCE

BOTTOM-UP METHOD

POWER BRAKE VALVE

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 12–41.—Use of blowout screen on overheated brakes. Heat transfer to the wheel will continue for some Once the brake has been properly cooled, permit the period of time until the brake is cooled. The danger of explosive failure may exist after the aircraft is secured if action is not taken to cool the overheated brake. The recommended procedure for cooling overheated wheel, brake, and tire assemblies is to park the aircraft in an isolated location. Allow the assembly to cool in ambient air for a period of 45 to 60 minutes. The use of cooling agents to accelerate cooling is not recommended unless operational necessity dictates their use. The application of the agents exposes personnel to danger by requiring their presence near the overheated assembly. However, if it is necessary to accelerate coding, use an intermittent stream of water or fog. When using water, direct a stream to the brake. The water should be applied in 10- to 15-second periodic bursts, not in a continuous discharge. Each application should be separated by a waiting period of at least 30 to 60 seconds. A minimum of three to five applications is usually necessary. When fog is used, the fog is deflected to the brake side of the wheel for a period of 5 to 10 seconds. Each application should be separated by a waiting period of at least 20 seconds. This method is applied as long as it is necessary to control the temperature of the affected assembly. wheel to cool in ambient air. A crosswind or forced air from a blower or fan will assist in cooling the wheel. The aircraft should not be moved for at least 15 minutes after cooling operations. BRAKE SYSTEM COMPONENT MAINTENANCE Learning Objective: Recognize the various componen ts of a representative brake system, such as valves, reservoirs, and swivels. Identify the operation of a brake master cylinder. Components of brake systems are not peculiar to any one system. A given component will vary in shape, size, capacity, and manner of operation (depending upon the manufacturer), but the function remains the same. In this section, we will discuss some of the more common brake system component maintenance practices. INDEPENDENT SYSTEM RESERVOIR Repair of this brake reservoir is limited to disassembly, cleaning, and replacement of high usage parts from a cure-date repair kit. These high usage parts consist of a new sight glass with its O-ring seal, washer, 12-45

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