See the applicable candidate handbook for further information. Without achieving 80% you will fail the test and would not be allowed to drive vehicles that have air brake system. Knowledge of the air brake system is essential for anyone desiring to obtain a commercial drivers license that allows operation of a vehicle with air brakes. We start at basic brakes defining the reason for brakes and testing. Brake lag the time air takes to travel through a properly maintained air brake system, about 410 of a second. Click this link to view and download the air brake book. The feed pipe is connected to the auxiliary reservoir and the brake pipe is connected to the brake cylinder through the distributor valve. If you want to have the air brake book pdf emailed to you, enter your email. The reservoir serves the air brake system as a storage tank for a volume of compressed air. When youre ready to book your written air brake knowledge test or practical air.
Federal motor vehicle safety standard 121 dictates how this is to be done for overtheroad vehicles. This helps to reduce the risk of ice in air brake valves and other parts during cold weather. The race section is extremely well done and provides useful information for anyone setting up a brake system on a drag, oval or road race vehicle. In starting breakmen have to jump from car for setting handbrakes.
The brake system design for this commercial vehicle can now proceed to the design of the pneumatic actuation system, which for most modern heavy commercial vehicles uses compressed air up to a maximum of about 8. Brake defects such as leaks are a major cause of accidents involving trucks. For official purposes, please refer to the drivers and vehicles act and. Distributor valve is the most important functional component of the air brake system and is also sometimes referred to as the heart of the air brake system. None of the different types of brake fluids should be mixed. In ontario, most large commercial vehicles are equipped with an air brake system. Air brake system anatomy understanding the three components of a commercial vehicle air brake system is crucial to diagnosing and repairing complex brake problems. The purpose of this book is to help you construct meritor wabco truck and tractor air systems. For official purposes, please refer to the drivers and vehicles act and the highway traffic act and regulations.
An air brake or, more formally, a compressed air brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to apply the pressure to the brake pad needed to stop the vehicle. Piston the piston is the heart of the control valve. You can use the study book in conjunction with either the air brakes test audiotape or videotape for a complete training program. The reservoir is sized by the vehicle manufacturer to provide an adequate volume of air for use by the braking system and auxiliary control devices.
Airactuatedhydraulic brake system 21 airboosthydraulic brake system 22 section summary questions 24 section 3how the basic system works 25 basic air brake system 26 oneway check valve 26 air pressure gauge 27 brake application gauge 27 low pressure warning device 27 stop light switch 27 quick release valve 28. From there we cover history of air brakes and the various components that make up a typical freight car. If equipped with a hydraulic brake reserve backup system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor. Typically, one system the primary system controls the regular brakes on the rear axles, and the other system the secondary system controls the brakes on the front axle and maybe one. Brake systems by ken layne if you remember the fundamentals of braking systems and think about maintaining the designed friction factors and getting the air out of the hydraulic system, your brake service will be more troublefree with fewer comebacks. March 2003march 2003 fire apparatus driveroperator 1afire apparatus driveroperator 1a slide 21119. This allows you to identify the areas that may need further study. You must have an air brake endorsement on your drivers licence to drive these vehicles. The 10th edition of the air brake book adds an update on air disc brake market. Air overhydraulic brake systems 21 air actuatedhydraulic brake system 21 air boosthydraulic brake system 22 section summary questions 24 section 3how the basic system works 25 basic air brake system 26 oneway check valve 26 air pressure gauge 27 brake application gauge 27 low pressure warning device 27.
It is driven by the vehicle engine, either by belt or drive gear, and on most vehicles, utilizes the vehicle lubrication and cooling system. Parts of an air brake diagram the design of any air brake valve is more easily understood by recognizing some major components and parts. The air brake system of a trailer is entirely dependent upon the air brake system of the towing vehicle for its air supply and control. Gritt 1062002 diagonal split system in a diagonal split system, one brake line is run to each rear brake and one to each front brake. If you want to drive a truck or bus with air brakes, or pull a trailer with air brakes, you need to read this section. Air brake system oneway check valve allows air to flow in one direction only all vehicles with air brakes must have a check valve located between the air compressor and the first reservoir. Applied stroke check air brake adjustment air brakes. To request a copy of this book in an alternate format, contact service ontario. The westinghouse air brake company was subsequently organized to manufacture and sell westinghouses invention.
A railway air brake is a railway brake power braking system with compressed air as the operating medium. Ava97923vnb1 1994 explains the design and functions of the components in the. Each vehicle and its air brake system may have features and components that. The air brake manual has been prepared by manitoba public insurance to assist drivers in understanding the basic operation and function of an air brake system. More importantly, it dramatically decreases stopping. Air brake manual government of newfoundland and labrador. A dual air brake system has 2 separate air brake systems, which use a single set of brake controls. The locomotive compressorcharges the feed pipe and the brake pipes throughout the length of the train. Detailed rules to use air brakes and brake downhill with a large vehicle safely. Learn about brakes and braking, components of an air brake, how the basic system works, trailer systems, dual air systems and pretrip inspection. Weighing the costs and benefits of air disc brakes despite maintenance and pad life advantages, price remains the biggest hurdle to air disc brake adoption.
Reading air brake diagrams tp2006 september 2001 4 part i. This distance depends on the ability of the lining to produce friction, the. Braking distance the actual distance a vehicle travels after the brake is applied until the vehicle stops. The connections are such that the left front and the right rear brake are on one circuit and. Meritor 03120981002 15 x 4 air brake drum, unbalanced, 8. Modern trains rely upon a failsafe air brake system that is based upon a design patented by george westinghouse on april, 1869. The air brakes test study book contains a sampling of practice questions and answers. Air brake system introduction in air brake system compressed air is used for operating the brake system. Note, not all valves have all the components shown and described in this booklet. It will also help you identify air system components and understand how they relate to fmvss121.
Brake adjusters handbook foreword this handbook is intended to serve as a reference for official brake adjusting stations and as study material for licensed brake adjusters and persons desiring to be licensed as adjusters. Air brakes are used in large heavy vehicles, particularly those having multiple trailers which must be linked into the brake system, such as trucks, buses, trailers, and. The brake pedal should not move depress during the five seconds. The systems described in this workbook are generic air brake systems. Page 1 of the air brakes test study guide for the cdl. Some air brake systems have an alcohol evaporator to put alcohol into the air system. Thanks so much for your interest in the 2019 ccj air brake book. Generally, more than one reservoir is used in air brake systems. If a spring brake is leaking from the the spring brake to the service brake side, that air will travel back up the service line and out the exhaust of the next valve back. Dual air brake system 2 foreword 4 air brake endorsement 4 requirements for air brake endorsement 4 making appointments for tests and testing locations 5 section one brakes and braking 7 heatenergytractionfriction 8 speedweightdistance 9 braking force 9 stopping distance 10 section summary questions 11. To pass cdl air brake test you need 80% correct performance. The purpose of an air brake system on heavy duty vehicles is to convert air pressure to mechanical energy to activate the foundation brakes. The brake pipe was connected to an air cylinder on each car. The next generation of brakes added a compressor to the locomotive.
In a dual system, there are two separate air brake systems, each with its own lines, hoses, air tanks, etc. Ice inside the system can make the brakes stop working. The purpose of this handbook is to introduce you to the knowledge and skills you need to drive a vehicle with air brakes in a safe and lawful manner. Therefore, the air air brake system of the towing vehicle must be in good condition. With the introduction of spring brakes, anticompounding and 121 air brake systems, because a valve is leaking air out of its exhaust, does not mean the valve is at fault. The freight car air brake training is designed around the single car test procedure per aar s486. The air compressor is the source of energy for the air brake system. This book, written for students, engineers, forensic experts, and brake technicians. Leaks in the air brake systems affect braking performance drastically by decreasing. Most heavyduty vehicles use dual air brake systems for safety. Truck systems air supply secondary service primary. As a racer, i use the second half of the book, written and photigraphed by mike mavrigian, which covers racing brake systems in great detail, for every type of racing use. Use this study manual to prepare for tests to get a yukon drivers license for heavy truck, bus or taxi.
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