Air Brake Manual

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SECTION THREE - HOW THE BASIC SYSTEM WORKS 25
Basic Air Brake System Air is pumped by the compressor (1) to the wet reservoir (5), which is protected from over pressurization by a safety valve (4). The governor (2) controls the pressure in the reservoir to the bottom of the foot valve (31). The driver pushes the foot valve treadle down and air pressure flows to the front and rear brake chambers (32 & 11). The brake chamber push rods move the slack adjusters. The slack adjusters rotate the S- cams, forcing the brake shoes against the drums. This causes friction that stops the wheels. The driver releases the foot valve treadle and the air in the brake chambers is allowed to exhaust through the foot valve, releasing the brakes. The following explains the additional components of a basic air brake system. Other valves which are necessary to ensure smooth and efficient operations are not included in this simple drawing. They will be discussed later in the manual. Note: An air dryer (3) has been added to reduce the amount of moisture in the system. One-way Check Valve In the diagram below, two reservoirs are shown (5)(10). To prevent air from flowing backwards in the system toward the compressor, a one-way check valve (7) is installed between the reservoirs. This One-way Check Valve Spring Body Ball Cap nut valve allows the air to flow in one direction only. The valve is spring loaded. Pressure at the inlet side overcomes the spring pressure and lifts the check valve ball, or disc, off its seat. Air passes through the valve to the outlet. When pressure at the outlet becomes greater than at the inlet - together with the spring pressure - the check device seats, preventing air from flowing back through the valve. Basic Air Brake System 32 31 11 2 32 1 3 4 5 7 9 10 11 26
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: Section Summary Questions 1. What a
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 54 and 55: SECTION SIX - DUAL AIR BRAKE SYSTEM
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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