Air Brakes Quiz Study Guide [With Practice Test]

Air Brakes Quiz Study Guide [With Practice Test]

Air Brakes

The CDL general cognition quiz covers several different sections. One optional section is the CDL Air Brakes test. Drivers who take and pass this test are eligible to drive vehicles that require a CDL allow and use an air brake system. The best way to prepare for your CDL Air Brakes Test is to use CDL practice tests for breeze brakes, CDL tune brakes study guides, and to take air brakes quizzes then you feel comfortable with the data before it ’ s time to take your trial for real number .
We ’ ve compiled a helpful resource on the basics you will need to know to pass your CDL Air Brakes Test, along with a practice breeze brakes quiz to get you started .

Use of Air Brakes

Air brakes are used on heavy trucks and buses because it provides a safe and authentic way to safely stop big moving vehicles .

Benefits of Using Air Brakes

  • Air brakes have respective benefits over traditional hydraulic braking systems including :
  • They provide dependable brake. Air brakes use atmospheric vent that never runs out, preferably than fluid which can leak .
  • They are easy to remove and attach .
  • They offer operate pressure and stand-in publicize tanks to compensate if the compressor fails .
  • They remain effective even if there is an air travel leak .

Air Brake Features

Air brakes include a variety show of features to improve braking see and ensure backups for safety. These features include :

  • Service Brakes
  • Parking Brakes
  • Control Pedal
  • Air Storage Tank
  • Air Pressure Gauge
  • Wig Wag Device

Properties of Air Brakes

Air brakes have unlike properties than traditional hydraulic brakes. For trucks with air brakes, the brake is held using form press and air pressure. The air pressure comes from atmospheric tune and is compressed into the hand truck ’ s air compressor until the reservoir is around 120 PSI .

Parts In an Air Brake System

Air braking systems have respective parts to ensure dependable and proper brake dominance for large vehicles. Air brake systems are broken into two main parts : the supply arrangement and the control condition organization. The supply system uses an :

  • Air Compressor
  • Air Compressor Governor
  • Air Storage Tanks
  • Air Tank Drains
  • Alcohol Evaporator
  • safety Valve

The issue system besides contains a smaller flush reservoir to store and clean atmospheric atmosphere. This publicize is stored in the supply reservoir which sends the tune to the parking brake reservoir, primary reservoir, junior-grade reservoir, and accessory vent supply distribution point .
The second main separate of an breeze brake system, the control organization, is divided into a preview brake racing circuit and a parking bracken racing circuit, equally well as brake circuits for the front and rear wheels. There is besides a front and back reservoir that serve as backups for any tune leaks. The provide and service lines ensure proper braking serve and admit :

  • The Brake Pedal
  • Foundation Brakes

  • Supply Pressure Gauges
  • Application Pressure Gauges
  • Low Air Pressure Warning
  • Stop Light Switch
  • Front Brake Limited Valve
  • spring Brakes
  • Parking Brakes
  • Anti-Lock Brakes

Differences Between Air Brakes and Traditional Brakes

The main difference between breeze brakes and traditional brakes ( besides known as hydraulic brakes ) is that traditional brakes use fluid to stop the fomite and vent brakes use compressed air. Air brakes are used on larger, heavier vehicles because they are more dependable and have less room for error than traditional hydraulic braking systems .

Air Brakes Quiz Study Guide [With Practice Test]

What Is An Air Brake Test?

If you plan to drive a hand truck that requires the use of air brakes, you must take the Air Brake Test as part of getting your CDL. The Air Brake Test covers the unlike braking systems and tests you on your cognition of parking brakes, overhaul brakes, hand brake brakes, reading first gear imperativeness warnings, checking atmospheric pressure gauges, and more .

How Many Questions Is The Air Brake Test?

The CDL Air Brakes Test is region of the CDL written knowledge screen and consists of 25 questions. You can prepare for the test by taking our air brakes quiz or another CDL drill test for vent brakes, and using a CDL air brakes study guide .

Are Air Brakes An Endorsement?

Air brakes are not considered a CDL endorsement even though the test is optional. This is because not taking the CDL Air Brake Test acts as a restriction on your CDL alternatively of an second of extra drive skills .

Can Anyone Drive a Vehicle With Air Brakes?

No, if you ’ re not familiar with air travel brakes, even if you know how to drive a stick shift, it ’ s improbable you will be able to drive a fomite with air brakes. When you start a vehicle with air brakes and undertake to move the fomite before releasing the brake, the vehicle will refuse to move. This is normally accompanied by a violent spang and the locomotive shutting down .
In ordering to drive a fomite with atmosphere brakes, you must not entirely have virtual have and practice, but you must besides pass the Air Brake Test as contribution of your CDL to legally drive these vehicles .

Parts Of An Air Brake System

Air brakes have five independent components that work together to provide dependable and effective brake for big vehicles. These components include a compressor, reservoirs, a animal foot valve, brake chambers, and brake drums, shoes, rotors, and pads. These components ensure your air brakes are effective and stop your vehicle .

1. Compressor

The compressor ’ s serve is to pull in breeze from outside and compress it to around 120 PSI. The air compressor is normally powered by the truck ’ mho locomotive and most use the hand truck ’ sulfur cooling and lubrication systems to work, although some are air-cool and self-lubricated. If the air compressor is self-lubricated. it must have the oil checked and changed regularly. Air compressors besides feature filtration systems to make sure the compressed atmosphere is free of moisture and particles .

2. Reservoirs

Compressed air is then loaded into reservoirs which hold the atmosphere supply necessity to stop the vehicle. Reservoirs preceptor ’ metric ton precisely carry enough vent for one full period ; they store adequate air to make respective stops, even if the engine or compressor stops working. The atmosphere from the reservoir is applied to the braking system via the animal foot valve .

3. Foot Valve

The foot valve dictates the sum of publicize coerce that is sent to the brakes when the driver presses the brake pedal. Pressing the foot valve applies more air pressure and releasing it sends air our through the exhaust port. Valves can either be overhead with a hanging foot pedal, or mounted in the floor .

4. Brake Chambers

Once the foot valve has been pressed, service-brake chambers move the compressed air from the reservoir into the brake bedroom, which pushes on the diaphragm. This causes the press rod assembly to move forward, slowing the hand truck .

5. Brake Drums and Shoes

Moving the push button rod forward allows the brake shoes to apply friction to the drums when the S-cam is rotated in a way that allows them to act against the cam rollers. When the S-cam rotates back to its normal position, the pressure is released .

Why Do Trucks Use Air Brakes Instead Of Hydraulic Brakes

It ’ s much easier to access tune than it is to get hydraulic fluid. however, the main rationality trucks use publicize brakes rather of hydraulic brakes is that leaks in an airbrake system won ’ deoxythymidine monophosphate jumper cable to complete bracken failure. alternatively, if your car experienced a hydraulic fluid leak, your brakes would cease to work.

Stopping a heavy fomite is much more difficult than stopping a even car. A heavy vehicle speeding down the road presents a much greater risk and air out brakes create a authentic brake system—without the drawbacks of traditional hydraulic brakes .

Do You Need A CDL To Use Air Brakes?

The simple answer is no. If you are driving a fomite that does not meet the standards required for a CDL such as vehicles under 26,000 pounds and carrying less than 15 passengers, you are not required to have a CDL, even if the vehicle has air brakes .
When it does come time to get your CDL and take your CDL Air Brakes Test you should prepare by taking CDL practice tests for air brakes and using a CDL atmosphere brakes study guide like the one we ’ ve provided. If you want foster practice, check out our air brakes quiz to brush up on your skills before your test day.

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Category : Car Brakes