BC Transit â Air Brake Course

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Primary <strong>Air</strong> Loss in a Simple Dual Circuit System This time the air loss occurred in the primary system. The one-way check valve at the inlet to the secondary reservoir will close to protect that air. The low air warning devices will activate by 60 psi., and the governor will load the compressor at 85 psi or better. Again, air from the compressor is being pumped to atmosphere. The front brakes are the only brakes working. Since this is a long wheel base vehicle, where most of the braking is accomplished by the rear brakes, we are in serious trouble! We’ll see how to fix this undesirable situation in a few minutes. Left click for animation 180
Adding the Park <strong>Brake</strong> (spring brake) A two-way check valve has been added just downstream from the primary and secondary reservoirs. During normal operation, air from both reservoirs flows through this two-way check valve, in approximately equal amounts. This air is referred to as “blended air.” It then flows through the park brake control valve (when open) and on to the spring brakes, holding them in the released position. Left click for animation 181
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BC Transit - Air Brake Course Prese
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BC Transit - Air Brake Course 1. Ai
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BC Transit - Air Brake Course 1. Ai
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BC Transit - Air Brake Course 2. De
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The final factor that will determin
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Weight - Speed - Distance When weig
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Perception Time (See-Think) Percept
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4/10 sec. Brake Lag (mechanical lag
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Stopping Distance…(total stopping
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Apply the principal from the previo
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Using Compressed Air to Our Advanta
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Combining mechanical advantage to a
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As the driver applies the brake ped
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Review Questions: Section 1 1) What
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BC Transit - Air Brake Course 3. Fi
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The Governor The governor may be co
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One-way Check Valve The one-way che
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Air Lines • Air lines link compre
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Safety Valve The Reservoirs One-way
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Air Gauges 60 50 40 70 80 85 90 100
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The Foot Valve The foot valve contr
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The Foundation Brakes: Brake Chambe
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Automatic Slack Adjusters Pre-Trip
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Brake Chambers and Slack Adjusters
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Review Questions: Section Three 1)
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BC Transit - Air Brake Course 4. Ba
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No. 2 GOVERNOR: tells compressor wh
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No. 4 AIR LINES: link air from one
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No. 11 BRAKE SHOES AND LININGS: sho
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No. 13 SLACK ADJUSTER: provides a m
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No. 15 BRAKE CHAMBER: part of force
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Quick Release Valve and Stop Light
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The Relay Valve The relay valve pro
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In this diagram, the dark green lin
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• Because the relay valve accesse
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A spring type park brake serves thr
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However, some valves may be designe
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Park Brake and Service Brake Releas
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Park Brake Applied - Service Brake
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Mechanical Release of the Park Brak
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“Maxi-Brake” type Park Brake Th
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“Maxi-Brake” Operation (single
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Park brake systems with double cont
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Park Brake Emergency Functions... 1
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No. 6 LOW AIR WARNING DEVICE: activ
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No. 8 RELAY VALVE: provides quicker
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Review of Section Four 6) Why is it
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BC Transit - Air Brake Course 5. Ot
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ATC (Automatic Traction Control)
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Long Stroke Push Rods Many new air
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Disc Brakes Callipers Rotor …oper
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Wedge Brakes This type of brake use
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Section Six Single Circuit Tractor
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Parts of the Trailer (van style) 1)
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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
Page 133 and 134: 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
Page 139 and 140: The Hand Valve The Hand Valve is mo
Page 141 and 142: The Tractor Protection Valve The Tr
Page 143 and 144: 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
Page 151 and 152: Emergency Functions The following s
Page 153 and 154: Supply Line Rupture (trailer intact
Page 155 and 156: Supply Line Rupture (handling the s
Page 157 and 158: Service Line Rupture (continued) 1)
Page 159 and 160: Loss of Main Reservoir Air In this
Page 161 and 162: Supply & Service Lines Crossed (air
Page 163 and 164: Three Tests to Confirm Emergency Re
Page 165 and 166: Three Tests to Confirm Emergency Re
Page 167 and 168: Review Questions Section Six (Tract
Page 169 and 170: 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: Secondary Air Loss (Foot Valve Appl
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
Page 211 and 212: L-75 Off Highway Combination with S
Page 213 and 214: Schedule SX Trailer (spring equippe
Page 215: Thank you for viewing this Air Brak
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BC Transit â Air Brake Course

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BC Transit â Air Brake Course