Air Brake Manual

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Dual Air Brake System 29 31 1 4 5 7 8 9 10 In the illustration, air is pumped by the compressor (1) to the supply/wet reservoir (5) (blue), which is protected from over pressurization by a safety valve (4). Pressurized air moves from the supply/wet reservoir to the primary/dry reservoir (8) (green) and the secondary/dry reservoir (10) (red) through oneway check valves (7). At this point, the dual circuits start. Air from the primary/dry reservoir is directed to the foot valve (31). Air is also directed from the secondary/dry reservoir to the foot valve. The foot valve is similar to the one described earlier in the basic air brake system, but is divided into two sections (two foot valves in one). One section of this dual foot valve controls the primary circuit and the other controls the secondary circuit. When a brake application is made, air is drawn from the primary reservoir through the foot valve and is passed on to the rear brake chambers. At the same time, air is also drawn from the secondary reservoir, passes through the foot valve and is passed on to the front brake chambers. If there is air loss in either circuit, the other will continue to operate independently. Unless air is lost in both circuits, the vehicle will continue to have braking ability. The primary and secondary circuits are equipped with low air pressure warning devices, which are triggered by the low air pressure indicator switch (9) and reservoir air pressure gauges (29) located on the dash of the vehicle. Dual-circuit Foot Valve Supply ports Treadle Exhaust port Delivery ports 55
Dual Air Brake System with Spring Parking Brakes 27 26 When spring brakes are added to a dual air brake system, the same type of dash control valve discussed previously is used. Blended air is used to supply the spring parking brake control valve (27). Blended air is air taken from the primary and secondary circuits through a two-way check valve (26). With this piping arrangement the vehicle can have a failure in either circuit without the spring brakes applying automatically. If air is lost in both circuits, the spring brakes will apply. 56
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 54 and 55: SECTION SIX - DUAL AIR BRAKE SYSTEM
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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