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20 Cards in this Set
- Front
- Back
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what are the five main components of any brake system |
1. A compressor 2. A reservoir or tank 3. A foot valve 4. Brake chambers and slack adjusters 5. Brake linings and drums or rotors |
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A governor: |
Controls the minimum and maximum air pressure in the system by controlling when the compressor pumps air. |
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The first reservoir after the compressor is called the |
wet tank/reservoir |
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AIR dryers are usually installed between |
the compressor and the wet tank |
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____ prevent reservoirs from being over pressurized should the governor malfunction |
Safety Valve |
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what pressure are safety valves normally set at? When do they reset after being tripped? |
150 psi/ 135 psi
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An air treadle is part of the ____ _____
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foot valve |
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what connects the pushrod to the slack adjuster |
the clevis and pin
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what is the function of the slack adjuster?
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to take up slack" as the brake linings/pads wear" |
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when brakes are applied the angle between the pushrod and the slack adjuster arm should be no more than___ degrees
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90 deg
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slack adjusters on (most) DFD rigs are |
self adjusting
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disc brakes use a ___ ____ that acts like a c-clamp on the disc applying force equally to both sides |
power screw |
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when the driver pushes down on the foot valve treadle, air flows from the ____ to the ____
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reservoir(s) to the front and rear brake chambers |
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when the driver releases pressure on the foot valve air pressure in the brake chambers |
is allowed to exhaust through the foot valve releasing the brakes
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to prevent air from flowing backwards in the system and ___ ____ ___ ____ is installed between the reservoirs |
one way check valve
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the wet tank usually does not have a ____ ____, only the primary and secondary tanks do.
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pressure gauge
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the brake light are activated by
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an air operated electric switch
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in a dual air system the primary reservoir refers to the |
rear reservoir (rear brakes)
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ABS system consist of three main components
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1. An electronic control unit (ECU) 2· A wheel sensor and tooth wheel 3· ABS valves |
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in rigs using an engine brake the ABS system will |
turn off the engine brake until traction is retained |
