Air Brake Manual.pdf

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Newfoundland and Labrador
N"ewfo dland
Labrador
Department of Government Services and Lands
Motor Registration Division
Newfoundland
and Labrador
AIR BRAKE
MANUAL
FOREWORD
In keeping with the class licence system ilnd with speciill
regilrd to the air br"kc endorsement, this manual hels been
compiled to assist you in your underst,lIlding of the b,lSic
functions of the air brake system.
rhe study of this manuell, along with prilctical instruction,
is recommended to persons who arc preparing for the
completion of the air brake examinations as administered
by the 1otor Registration Di\ ision, Dep,lrtmellt of
Covernment Services and I.ilnds.
The diagrams in this manual arc for instruction'll purposl's
alld Ml' not to be inkrpreted ilS regulations.
Study questions arc included so that you may test your
underst'lnding of the subject.
Credit ior the compiling of this milnuell goes to the British
Columbia :VIator Vehicles I3ranch. It is presently used under
a number of jurisdictions in Canilda ,md the United St,ltL'".
2
CONTENTS
SECTION I
BRAKES AND BRAKING
Heat, Energy, Traction, Friction
Speed, Weight, Distance
How We Obtain Power
Stopping Distance ... ......... ..
Section Summary Questions
.. ...
... .
6
6
7
.... 8
8
SECTION II
THE COMPONENTS OF AN AIR BRAKE SYSTEM
Compressor
Reservoirs
Foot Valve
Brake Chambers and Slack Adjusters
Wedge Type Brake
Disc Brakes
Section Summary Questions
12
13
14
14
16
16
17
Hand Operated Valve
Two-Way Check Valve
Tractor Protection
Automatic Trailer Supply Valve System
Trailer Supply Valve
Tractor Protection Valve
Tractor and Trailer Unit Coupled
Charging the Trailer System
Brake Application - Foot Valve
Brake Application - Hand Valve
Emergency Applications
Service Line Rupture
Supply Line Rupture
Loss of Main Reservoir Air
Manually Operated Trailer Supply Valves
Section Summary Questions
31
31
33
33
34
34
36
36
37
37
38
38
39
39
40
41
SECTION V
DUAL AIR SYSTEMS
SECTION III
HOW THE BASIC SYSTEM WORKS
Simple Air Brake System
One Way Check Valve
Gauges
Brake Application Gauge
Low Pressure Warning
Wig-Wags
Stop Light Switch
Quick Release Valve
Relay Valve
Front Wheel Limiting Valve
Tandem Rear Axles
Parking Brakes
Dual Control Valve and Reservoir System
Mechanical Release
Section Summary Questions
20
20
21
21
21
21
21
21
22
22
23
24
26
26
27
A Simple Dual Circuit Air System
Combination Truck and Trailer
T-75 Off-Highway System, Single Unit
L-75 Off-Highway System, Combination with
Schedule XTrailer
Schedule SX, Off-Highway Trailer with
Spring Brake
Section Summary Questions
44
46
47
48
48
49
SECTION VI
PRE-TRIPPING
Single Unit
Combination Unit
Brake Adjustment
Air Operated Disc Brakes
In
Service Check .,.. ............................................
Maintenance and Servicing of the Air Brakes
Section Summary Questions
52
52
53
53
53
54
54
SECTION IV
TRAILER SYSTEMS
Glad Hands
Application Line
30
30
3
SECTION I
SECTION I
BRAKES AND
BRAKING
HEAT, ENERGY,
TRACTION, FRICTION
SPEED, WEIGHT,
DISTANCE
HOW WE OBTAIN POWER
STOPPING DISTANCE
SECTION SUMMARY
QUESTIONS
5

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