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31 Cards in this Set
- Front
- Back
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What are the 3 types of of brake systems?
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Service,parking, and emergency.
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What is the "cut out" level of the Air Compressor Governor?
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125psi
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What is the "cut in" level of the Air Compressor Governor?
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100psi
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Why must you drain your air tanks?
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So water and compressor oil do not sit in the tank.
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What is an Alcohol Evaporator?
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It sends alcohol into the tank to reduce the risk of water freezing in side tank.
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What is the Safety Relief Valve?
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It protects the tank and the rest of the system from too much pressure.
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At what psi does the Safety Relief Valve open?
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150psi
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What is the most common type of brake drums?
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S-cam
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What is the Supply Pressure Gauge?
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It shows how much pressure you have in your tank(s)
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What is the Application Pressure Gauge?
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It shows you how much pressure is being applied to the brakes.
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All trucks have Application Pressure Gauge?
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false
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Increasing application pressure to hold the same speed means?
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The brakes are fading, out of adjustment, an air leak, or mechanical problems.
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A Low Air Pressure Warning is required on all vehicles with air brakes?
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true
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At what psi will the Low Air Pressure Warning activate?
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60psi
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What year did they stop putting "Front Brake Limiting Valve" on trucks?
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1975
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Are front brakes good for all conditions?
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yes
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At what psi will the spring brakes come on fully?
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20-45psi
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What is a Dual Air Brake system?
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2 separate air brake systems which use a single set of brake controls.
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Before driving a vehicle with a Dual Air Brake system how much psi should you let build up?
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100psi
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How do you check Manual Slack Adjusters on S-Cam brakes?
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Park vehicle on level ground and chock wheels. Turn off parking brakes so you can move the Slack Adjusters Pull on Slack Adjusters.
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How far should a Slack Adjuster move?
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Anywhere less than 1 inch where the pushrod attaches to it.
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With a fully charged air system,the engine off, and you have released the service. What should the loss rate be?
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It should not drop more than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles.
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With a fully charged air system, the engine off, and you apply 90 psi to the brake. After the initial drop what should the loss rate be?
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It should not drop more than 3 psi in 1 minute for single vehicles or more than 4 psi in 1 minute for combination vehicles.
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What is the Air Pressure Buildup rate?
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Pressure should build from 85 psi to 100 psi within 45 seconds in dual air brake systems.
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What is "Controlled Braking"?
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When you apply the brakes without locking up the wheels.
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What is "Stab Braking"?
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When you apply the brakes all the way and the wheels lock up you release and repeat.
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When going down a long or steep downgrade how should you brake?
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Apply the brakes just hard enough to feel a definite slow down. When you speed has reduced to 5 mph below your "safe speed" release you brakes. When your speed is back into your "safe speed". Then repeat
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You should not use your Parking Brake under what conditions?
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If they are very hot or very wet in freezing temps.
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What are Slack Adjusters?
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It is the piece that connects the push rod to the camshaft of the s-cam brake.
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What factors can cause brakes to fade or fail?
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Excessive heat, Excessive braking, out of adjustment,
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Heat can cause out of adjustment brakes to fade quicker?
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true
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