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42 Cards in this Set
- Front
- Back
What does the Air compressor do?
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It pumps air into the air storage tanks.
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What should you do if the air compressor has it's own oil supply?
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Check the oil level before driving.
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What does the Air Compressor Governer do?
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Controls when the air compressor pumps air into the air storage tanks.
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What do the air storage tanks do?
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They store air. duh.
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What are the Air Tank Drains for?
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They manually drain water and oil from the air tanks.
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Why do you have to drain the air tanks?
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To prevent brake failure due to water expanding when it turns into ice during cold weather.
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What is the Alcohol Evaporator for?
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It puts alcohol into the air tank reducing the risk of ice in the air brake valves during cold weather.
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At what psi will the safety valve open to prevent too much pressure in the air brake system?
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150 psi
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What will happen if the air pressure gets too low?
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The brakes won't work.
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How do S-cam brakes work?
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They force the brake shoes away from one another and presses them against the inside of the brake drum
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How do Wedge brakes work?
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THe brake chamber push rod pushes a wedge directly between the ends of two brake shoes.
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How do Disc Brakes work?
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the pressure of the brake chamber on the slack adjuster turns the power screw which clamps the disc or rotor between the lining pads of a caliper
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What is the most common brake?
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S-cam
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What do the Supply pressure gauges tell you?
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How much pressure is in the air tanks
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What do the application pressure gauges tell you?
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How much pressure is being applied to the brake
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True or False: Low Air pressure Warnings are required on vehicles with air brakes.
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True
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At what psi must the Low Air Pressure Warning come on before?
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60 psi
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What should you do when the Low Air Pressure Warning light comes on?
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bring the vehicle to a complete stop as safely as possible
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What will cause the spring brakes to come on
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a leak in the air brake system
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At what psi will the spring brake come on?
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20-45 psi
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If the brakes are not adjusted properly which brakes will not work right?
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none of them, service, parking, and emergency
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What does the parking brake look like?
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A yellow, diamond-shaped push-pull knob
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What does the modulating control valve do?
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applies the spring brake gradually for better feel of braking action
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What do the dual parking control valves do?
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lets you release air from a separate air tank to move the vehicle in emergencies
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What is the Anti Lock Brake System (ABS)?
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A computerized system that keeps your wheels from locking up during hard brake applications
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How does the Dual Air Brake work?
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has two separate air brake systems which use a single set of brake controls
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How much psi must you let build up in a dual air brake system before you drive?
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100 psi
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What happens when one air tank in a dual air brake system is very low on pressure?
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either the front or the rear brakes will not be operating fully and it will take you longer to stop.
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What should you do when one of the air tanks in a dual air brake system loses pressure?
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bring the vehicle to a complete stop and have the air brakes system fixed.
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When should you push the clutch in a normal stop?
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when the engine rpm is down close to idle.
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What can happen when you brake hard on a slippery surface in a vehicle without ABS?
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Your wheels may lock up.
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What happens when your steering wheels lock up?
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You lose steering control.
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What happens when your non steering wheels lock up?
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You may skid, jackknife, or even spin the vehicle.
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What should you do if your Anti Lock Brake System malfunctions?
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You still have your regular brakes. Drive normally, but get the system serviced soon.
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What is controlled braking?
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apply the brakes as hard as you can without locking the wheels. If wheels lock, release the brake. Re-apply the brakes as soon as you can.
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What is Stab Braking?
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Apply your brakes all the way. Release brakes when they lock up. As soon as the wheels start rolling, apply the brakes fully again. repeat.
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Which works faster: hydraulic or air brakes?
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hydraulic brakes
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At 55 mph on dry pavement what is the air brake lag distance?
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32 feet
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At 55 mph under good conditions what is the total stopping distance?
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451 feet
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What can happen if the brakes overheat?
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brake fading or failure
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What is proper braking technique for going down a hill?
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Once in low gear, apply the brakes just hard enough to feel a definite slowdown. When your speed has been reduced to approximately 5 mph lower than your "safe" speed, release the brakes. When your speed has increased to your "safe" speed, repeat.
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When should you not use the parking brake?
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if the brakes are hot or if the brakes are very wet in freezing temperatures. Use wheel chocks instead.
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