Heavy truck brakes Study guides, Class notes & Summaries
Looking for the best study guides, study notes and summaries about Heavy truck brakes? On this page you'll find 54 study documents about Heavy truck brakes.
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Heavy truck brakes test exam questions and answers
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Heavy truck brakes test exam questions and answers
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HEAVY TRUCKS BRAKES EXAMS PACKAGE DEAL|ALL YOU NEED TO KNOW|DOWNLOAD TO PASS
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HEAVY TRUCKS BRAKES EXAMS PACKAGE DEAL|ALL YOU NEED TO KNOW|DOWNLOAD TO PASS
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chapter 28 truck brake systems exam questions and answers
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In what year was FMVSS-121 introduced? A. 1997, B. 1998, C. 1975, or D. 1957? 
1975 
 
 
 
When a truck has no air pressure in its tanks, which warning devices are activated when the ignition key is turned on? A. A buzzer, B. Red light, C. A dash gauge, or D. All of the above. 
all of the above 
 
 
 
what legislation mandates every required standard of a highway truck air brake system A. osha B. fmvss 105 C. fmvss 121 D. nhtsa 
C. FMVSS 121 
 
 
 
if a truck is FMVSS 121 compliant, which of the...
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CDL Air Brake Practice Test exam questions and answers
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he parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like: 
 
a. Fluid pressure 
b. Spring pressure 
c. Air pressure 
d. Any of the above 
b. Spring pressure 
 
 
 
A straight truck or bus air brake system should not leak at a rate of more than __ psi per minute with the engine off and the brake released. 
 
a. 1 
b. 2 
c. 3 
d. 4 
c. 3 
 
 
 
Your vehicle has dual air brake system. If low air pressure warning comes on for the secondar...
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Chapter #28 -Truck Brake Systems exam questions and answers
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Where should grease be applied on an S-cam brake system components? 
cam roller pocket race 
 
 
 
What is the primary function of a relay valve? 
remote controlled service brake valve 
 
 
 
Which of the following factors can affect the timing of service brakes? 
relay valve crack pressures 
hose and tubing diameters and length 
replacing a 45-degree fitting with a 90-degree fitting 
 
 
 
What is the potential energy of an air brake system? 
compressed air 
 
 
 
What are S-cam type foundation...
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Heavy Duty Braking Fundamentals exam questions and answers
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AL Factor 
The size or surface area of a brake chamber multiplied by the length of the slack adjuster in inches 
 
 
 
Anti-fade 
An opposite condition of heat fade where the coefficient of friction increases as the brakes get hotter. 
 
 
 
Automatic Slack Adjusters (ASAs) 
Automatically adjust brake stroke to maintain the correct shoe-to-drum clearance. 
 
 
 
Brake Block 
Brake friction material that is 0.75 inch (19mm) thick. 
 
 
 
Brake Fade 
The inability of the brakes to maintain its eff...
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Heavy Duty Truck Systems - Chapter 29 exam questions and answers
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In hydraulic disc brakes, the pads are forced against the rotors by: 
the pistons 
 
 
 
As the pressure of fluid received by the wheel cylinder of a drum brake system increases, which of the following happens? 
The wheel cylinder cups and pistons are forced apart 
 
 
 
Which of the following safety devices delays application of front disc brakes in a disc/drum system until pressure is built up in the hydraulic system? 
a metering valve 
 
 
 
In a typical air-over-hydraulic brake system, -depr...
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chapter 2 heavy vehicle braking exam questions and answers
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heat 
form of energy in an internal combustion engine 
 
 
 
motion 
heat energy produced by engine combustion is converted to 
 
 
 
in stopping a vehicle, the energy of motion turns the vehicle's wheels, the wheels wont go anywhere unless theres ______ between the tires and the road surface 
traction 
 
 
 
what is a car engine 
heat conversion machine, taking the energy of heat from exploding mixture of fuel and air in the combustion chamber and converting it to motion through the engine cra...
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Heavy Duty Truck Systems - Chapter 31 exam questions and answers
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Which of the following is the best practice when instructed to block the wheels on a tractor/trailer combination? 
Place a pair of wedged wheel chocks on one tractor drive axle and one trailer axle wheel. 
 
 
 
What is the required amount of slack adjuster free travel on a properly adjusted, manual S-cam brake? 
3/8 to 5/8 inch 
 
 
 
Which of the following foundation brake components are lubricated with chassis grease, either for component life or as part of a lube job? 
S-cam bushings 
 
 
 
...
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Medium heavy duty brakes exam questions and answers
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The vehicle expections report the VIR should be submitted? 
Weekly 
 
 
 
Which of the following cannot a drum on an air braked vehicle to overheat? 
Too-high governor cut out pressure 
 
 
 
All the brakes drag on a truck with hydraulic brakes which of the following could be the cause? 
No brake pedal free travel 
 
 
 
Which of the following could cause a pulsating brake pedal on a truck with hydraulic brakes? 
And out-of-round brake drum 
 
 
 
Air pressure gauge charge an air pressure signal...
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