Air Brake Manual

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SECTION SIX - DUAL AIR BRAKE SYSTEM 53
More and more heavy duty vehicles on the road today are using a dual air brake system. The system has been developed to accommodate a mechanically secured parking brake that can be applied in the event of service brake failure. It also accommodates the need for a modulated braking system should either one of the two systems fail. It is actually two brake systems in one, with more reservoir capacity resulting in a much safer system. At first glance, the dual system might seem complicated, but if you understand the basic air brake system described so far, and if the dual system is separated into basic functions, it becomes quite simple. As its name suggests, the dual system is two systems or circuits in one. There are different ways of separating the two parts of the system. On a twoaxle vehicle, one circuit operates the rear axle and the other circuit operates the front axle. If one circuit has a failure, the other circuit is isolated and will continue to operate. Basic Dual <strong>Air</strong> <strong>Brake</strong> System 54
Page 1 and 2:
Air Brake Manual PUBLIC SAFETY Ce d
Page 3 and 4: Safety Tips 1. Reminder - is your c
Page 6 and 7: SECTION ONE - BRAKES AND BRAKING 5
Page 8 and 9: Speed-weight-distance The distance
Page 10: said that brake lag is the time it
Page 13 and 14: Section One of this manual has expl
Page 15 and 16: · Compression stroke: The upward m
Page 17 and 18: Safety Valve A safety valve (4) pro
Page 19 and 20: Air inlet Previously illustrated ar
Page 21 and 22: Brake lining material is attached t
Page 23 and 24: Air-actuated Hydraulic Brake System
Page 25 and 26: Section Summary Questions 1. What a
Page 27 and 28: Basic Air Brake System Air is pumpe
Page 29 and 30: Quick Release Valve The application
Page 31 and 32: Tandem Rear Axles 34 33 13 The air
Page 33 and 34: Spring Parking Brake Systems (Singl
Page 35 and 36: Closing the control valve shuts off
Page 38 and 39: SECTION FIVE - TRAILER SYSTEM 37
Page 40 and 41: Application Line “T” 13 20 31 T
Page 42 and 43: Hand Valve Application 30 26 31 In
Page 44 and 45: Tractor Protection System (closed)
Page 46 and 47: 30 28 26 24 20 31 In this illustrat
Page 48 and 49: Charging the Trailer System 28 24 3
Page 50 and 51: If a trailer that is not equipped w
Page 52 and 53: Loss of Reservoir Air Pressure 28 2
Page 56 and 57: Dual Air Brake System 29 31 1 4 5 7
Page 58 and 59: Spring Parking Brakes with Modulato
Page 60: Section Summary Questions 1. What i
Page 63 and 64: Axle Anti-lock Brake System (ABS) A
Page 65 and 66: Automatic Traction Control (ATC) Au
Page 67 and 68: Brake Adjustment On vehicles equipp
Page 69 and 70: S-cam Brake Adjustment with Manual
Page 71 and 72: · there are no air leaks; · the g
Page 73 and 74: Single Unit (Not for air over hydra
Page 75 and 76: · At 90 psi or above, release the
Page 77 and 78: Compressor and Warning Devices Chec
Page 79 and 80: METRIC CONVERTER mph MAXIMUM MAXIMU
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