BC Transit â Air Brake Course

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The Foot Valve Two typical foot valves are pictured here. The uppermost one is used primarily in buses. The lower example is suspended from the firewall and is used mostly in trucking applications. They operate in precisely the same way, being spring loaded and self-balancing. We need to know... •The foot valve is considered to be the most important valve in the system, because without it, we could not control brake application pressure. •It is a self-balancing device, meaning that even if a small leak occurred in the system during a brake application, the foot valve would regulate the application air such that the brakes would remain applied. •The foot valve is spring loaded, so the operator feels only the spring pressure, not the pressure of the brake application, as in a hydraulic brake system. •Maximum brake application pressure available at any time is only that which is present in the system’s reservoirs. Application pressure cannot exceed reservoir pressure. 46
The Foot Valve The foot valve controls application pressure. •Reservoir air is available at the base of the foot valve. (dark green) •Application air, as demanded by the operator, is delivered to the brake chambers. (light green and light red) •The further down the operator depresses the treadle, the more air pressure is delivered to the brake chambers. •When the treadle is released, the brake application is released. Front Application air Application air Rear Reservoir air 47
Page 1 and 2: BC Transit - Air Brake Course Prese
Page 3 and 4: BC Transit - Air Brake Course 1. Ai
Page 5 and 6: BC Transit - Air Brake Course 1. Ai
Page 7 and 8: BC Transit - Air Brake Course 2. De
Page 9 and 10: The final factor that will determin
Page 11 and 12: Weight - Speed - Distance When weig
Page 13 and 14: Perception Time (See-Think) Percept
Page 15 and 16: 4/10 sec. Brake Lag (mechanical lag
Page 17 and 18: Stopping Distance…(total stopping
Page 21 and 22: Apply the principal from the previo
Page 23 and 24: Using Compressed Air to Our Advanta
Page 27 and 28: Combining mechanical advantage to a
Page 29 and 30: As the driver applies the brake ped
Page 31 and 32: Review Questions: Section 1 1) What
Page 33 and 34: BC Transit - Air Brake Course 3. Fi
Page 35 and 36: The Governor The governor may be co
Page 37 and 38: One-way Check Valve The one-way che
Page 39 and 40: Air Lines • Air lines link compre
Page 41 and 42: Safety Valve The Reservoirs One-way
Page 43 and 44: Air Gauges 60 50 40 70 80 85 90 100
Page 45: BC Transit - Air Brake Course 3. Fi
Page 49 and 50: The Foundation Brakes: Brake Chambe
Page 51 and 52: Automatic Slack Adjusters Pre-Trip
Page 53 and 54: Brake Chambers and Slack Adjusters
Page 55 and 56: BC Transit - Air Brake Course 3. Fi
Page 57 and 58: Review Questions: Section Three 1)
Page 59 and 60: BC Transit - Air Brake Course 4. Ba
Page 61 and 62: No. 2 GOVERNOR: tells compressor wh
Page 63 and 64: No. 4 AIR LINES: link air from one
Page 65 and 66: No. 11 BRAKE SHOES AND LININGS: sho
Page 67 and 68: No. 13 SLACK ADJUSTER: provides a m
Page 69 and 70: No. 15 BRAKE CHAMBER: part of force
Page 71 and 72: Quick Release Valve and Stop Light
Page 73 and 74: The Relay Valve The relay valve pro
Page 75 and 76: In this diagram, the dark green lin
Page 77 and 78: • Because the relay valve accesse
Page 79 and 80: BC Transit - Air Brake Course 4. Ba
Page 81 and 82: A spring type park brake serves thr
Page 83 and 84: However, some valves may be designe
Page 85 and 86: Park Brake and Service Brake Releas
Page 87 and 88: Park Brake Applied - Service Brake
Page 89 and 90: Mechanical Release of the Park Brak
Page 91 and 92: “Maxi-Brake” type Park Brake Th
Page 93 and 94: “Maxi-Brake” Operation (single
Page 95 and 96: Park brake systems with double cont
Page 97 and 98:
Park Brake Emergency Functions... 1
Page 99 and 100:
BC Transit - Air Brake Course 4. Ba
Page 101 and 102:
No. 6 LOW AIR WARNING DEVICE: activ
Page 103 and 104:
No. 8 RELAY VALVE: provides quicker
Page 105 and 106:
Review of Section Four 6) Why is it
Page 107 and 108:
BC Transit - Air Brake Course 5. Ot
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
ATC (Automatic Traction Control)
Page 117 and 118:
Long Stroke Push Rods Many new air
Page 119 and 120:
Disc Brakes Callipers Rotor …oper
Page 121 and 122:
Wedge Brakes This type of brake use
Page 123 and 124:
Section Six Single Circuit Tractor
Page 125 and 126:
Parts of the Trailer (van style) 1)
Page 127 and 128:
The “Fifth Wheel” The fifth whe
Page 129 and 130:
Hooking Up (Step 2) A visual inspec
Page 131 and 132:
Charging the Trailer Brake Reservoi
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The Semi-Trailer Ready for its Pre-
Page 135 and 136:
Tractor-Trailer Trailer Air Brake S
Page 137 and 138:
Introduction to Valves and Componen
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The Hand Valve The Hand Valve is mo
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The Tractor Protection Valve The Tr
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Accidental Hand Valve Application (
Page 145 and 146:
The Trailer Supply /Delivery Line T
Page 147 and 148:
The Emergency Relay Valve The Emerg
Page 149 and 150:
Foot Valve Application (trailer con
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Emergency Functions The following s
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Supply Line Rupture (trailer intact
Page 155 and 156:
Supply Line Rupture (handling the s
Page 157 and 158:
Service Line Rupture (continued) 1)
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Loss of Main Reservoir Air In this
Page 161 and 162:
Supply & Service Lines Crossed (air
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Three Tests to Confirm Emergency Re
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Three Tests to Confirm Emergency Re
Page 167 and 168:
Review Questions Section Six (Tract
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BC Transit - Air Brake Course 7. Du
Page 171 and 172:
The Purpose of Dual Air Systems Dua
Page 173 and 174:
Identifying Primary and Secondary C
Page 175 and 176:
Primary and Secondary Systems (cont
Page 177 and 178:
The Simple Dual Circuit System One-
Page 179 and 180:
Secondary Air Loss (Foot Valve Appl
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Adding the Park Brake (spring brake
Page 183 and 184:
Primary Air Loss and Park Brake Fun
Page 185 and 186:
Enter the Modulator Valve The modul
Page 187 and 188:
The Modulator Valve (secondary air
Page 189 and 190:
The Modulator Valve (primary air lo
Page 191 and 192:
The Modulator Valve (primary air lo
Page 193 and 194:
Dual Air System Summary 1) The purp
Page 195 and 196:
BC Transit - Air Brake Course 8. Du
Page 197 and 198:
Combination Truck and Trailer with
Page 199 and 200:
SYSTEM PARK TRAILER SUPPLY TRACTOR
Page 201 and 202:
Combination Truck and Trailer (Supp
Page 203 and 204:
Combination Truck and Trailer (mixe
Page 205 and 206:
Combination Truck and Trailer (Prim
Page 207 and 208:
Section Review - Dual Air - Tractor
Page 209 and 210:
T-75 Off Highway System - Single Un
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L-75 Off Highway Combination with S
Page 213 and 214:
Schedule SX Trailer (spring equippe
Page 215:
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BC Transit â Air Brake Course