4800/4900/6900 Airline Numbering Circuits 101 to 256 Routed on chassis as a green #10 air line unlableded Page 1A-21 Description of air line location and function Rev (2.3) - Feb 2015 Airline Color/size Airline Number Airline Number Description Green/#10 101 Supply to service ‘A’ Red/#10 102 Supply to service ‘B’ Green/#10 103 Service ’A’ to brake valve supply Red/#10 104 Service ‘B’ to brake valve supply 105 Brake valve ‘A’ control to rear relay valve Red/#8 106 Brake valve ‘B’ control to front relay valve 107 Service ’A’ to forward rear relay valve 108 Service ‘A’ to rear-rear relay valve 109 Service ’B’ to front relay valve 110 Rear-rear relay valve to service brake chambers Red/#8 111 Front relay valve to service brake chambers 112 Wet supply reservoir to governor 113 Brake valve ‘B’ supply to double check valve 114 Double check valve park brake control valve 115 Park brake control valve to control valve - tractor trailer to tractor 116 Trailer park brake control valve to quick release valve 117 Quick release valve to frame tee 118 Drop line frame tee to axle tee 119 Drop line inversion valve to axle tee 120 Quick release valve / double check valve or axle tee to spring brake chambers 121 Park brake control valve to tractor protection control valve Orange/#6 122 Tractor protection control valve to tractor protection valve 123 Brake valve ‘A’ to double check valve 124 Brake valve ’B’ to double check valve 125 Double check valve to tractor protection valve 126 Brake valve ’A’ to hand control valve 127 Hand control valve to double check valve 128 Hand control valve exhaust 129 Front axle ratio valve to inversion valve 130 Service ’A’ to inversion valve 131 Wedge brake chamber to wedge brake chamber 132 Tee to anti-skid power switch 133 Tee to double check valve ‘A’ system Green/#8 134 ‘B’ system to double check valve 135 Tee to normally closed switch (“Kelsey Hayes” only) 136 Brake valve ‘B’ to forward rear relay valve 137 Rear axle relay valve to frame tee Yellow/#8 138 Manifold supply - accessories 139 Park brake control to tractor protection control valve port 140 ‘B’ supply to air gauge 141 ‘A’ supply to air gauge 142 Quick release / double check valve to rear-rear relay valve 143 Boost tank to tractor protection valve 144 Park brake valve relay supply 145 Forward rear relay valve to front brake valve 146 Brake valve ‘A’ to forward rear relay valve 147 Brake valve ’B’ to rear-rear relay valve 148 Brake valve ‘A’ to park brake control valve 149 Brake valve ‘B’ to park brake control valve 150 Bobtail ratio valve control Airline Number Airline Number Airline Number Description 151 Transmission - stationary / mobile control valve feed (s) 152 Transmission - stationary / mobile control valve feed (m) 153 Transmission - neutral cylinder feed 154 Transmission - stationary / mobile control valve (s) delivery to splitter position sensing Transmission - stationary / mobile control valve (s) delivery to sequence protection valve 155 156 Transmission - neutral cylinder to sequence protection va lve 157 Transmission retarder - skinner solenoid valve to retarder 158 Transmission retarder - pressure switch to skinner valve 159 Transmission retarder - skinner valve to foot valve 160 Transmission retarder - control valve to supply 161 Auxiliary transmission - control valve port 2 to shift cylinder 162 Auxiliary transmission - control valve port 4 to shift cylinder 163 Rear-rear pressure modulator valve to service chambers - ABS 164 Rear relay valve to rear-rear pressure modulator /double check valve - ABS 165 Anti-slip valve supply 166 Anti-slip valve delivery to rear-rear pressure modulator valve double check valve - ABS 167 Rear-rear pressure modulator valve delivery to un-sensored axle relay valve control - ABS 168 Front pressure modulator valve to front service chambers 169 Front quick release valve to front pressure modulator valve 170 Brakesaver - ‘A’ supply to brakesaver pressure regulator valve inlet 171 Brakesaver - regulating valve to hand control valve inlet 172 Brakesaver - hand control valve delivery to double check valve 173 Brakesaver - hand control valve exhaust 176 Brakesaver - double check valve to brakesaver application gauge 177 ATC/ASR relay valve delivery to un-sensored relay valve control - slaved 178 Rear rear relay valve delivery to ASR relay valve control – ASR/ATC 179 Tee 122 to BP-R1 bobtail valve 180 Not yet assigned 181 Not yet assigned 182 Not yet assigned 183 Not yet assigned 184 Not yet assigned 185 Not yet assigned 186 Transfer case - supply from fail-safe side of pressure protection valve 187 Transfer case - 2 speed shift dual shuttle valve to cylinder - A, B, C, D 188 Transfer case - front axle disengage 189 Transfer case - front axle engage 190 Bendix cruise control - supply tank to pressure protection valve 191 Bendix cruise control - pressure reducing valve to solenoid valve 192 Bendix cruise control - solenoid valve to inversion valve 193 Bendix cruise control - brake valve ‘A’ delivery to inversion valve 194 Bendix cruise control - inversion valve to air cylinder 195 Transfer case control - control valve to transfer case 196 Transfer case control - 2 speed shift - low 197 Transfer case control - 2 speed shift - high 198 Transfer case control - neutral Airline Color/Size Airline Number Airline Number Description 201 Axle lift control line 202 ‘B’ or ‘C’ supply to lift control 203 Pusher load bag control - from pressure regulator 204 ‘B’ or ‘C’ supply to load bag relay valve 205 ‘B’ or ‘C’ supply to brake relay 206 Service brake lockout signal line 207 Steering lock signal line 208 Steering lock supply line 209 Steering stabilizer supply line 210 Pusher axle laden-side control valve supply - from pressure protection valve 211 Tee to unladen-side pressure regulator valve supply 212 Laden-side control valve to pressure regulator valve 213 Unladen-side pressure regulator valve to double check valve 214 Laden-side pressure regulator valve to quick release valve 215 Quick release valve to double check valve 216 Double check valve to load-bag relay valve control 217 Relay valve delivery to load-bags 218 Skinner solenoid valve to automatic trans modulator cylinder 219 Load air shocks - front 220 Load air shocks - rear 221 Fuel selector valve - supply line 222 PTO control line - main transmission - mount PTO 223 PTO control line - aux transmission or transfer case mount 224 Front drive axle - driver controlled differential lock 225 Air pressure gauge - rear suspension LH or single valve 226 Air pressure gauge - rear suspension RH valve 227 Air pressure gauge - single - accessory 228 Tractor protection valve to pilot relay valve 229 Brake valve 'A' to anti-compound DCV 230 Boost tank to pilot relay valve (Australia) 231 TPCS - supply line 232 TPCS - PCU to front axle tee 233 TPCS - front axle tee to inlet tube 234 TPCS - PCU to rear axle frame tee 235 TPCS - rear axle drop line 236 TPCS - drop line to rear axle inlet tube 237 TPCS - PCU to trailer connection 239 Cab or combined Cab/Sleeper air ride supply 240 Sleeper Air Ride Supply (when cab air ride is also used) 241 External ‘A’ system service line - Glad-hands at front 242 External emergency & park brake control - Glad-hands at front 243 External Supply - Glad-hand to supply tank 244 Supply air for Remote Park brake Release - ‘B’ tank to Solenoid valve 245 Auxiliary air source outlets - Pressure protected 246 Pintle Hitch air supply 247 Dual connection to EOF - Service - Hard plumbed 248 Dual connection to EOF - Emergency - Hard plumbed Yellow/#8 249 ‘B’ reservoir press.
protection valve to under cab accessory manifold 250 Rear relay delivery valve to inversion valve control port 251 Air Supply to pressurized Bell Housing 252 Receiver Tank to Governor 253 Air Dryer Control to Air Dryer 254 Air Dryer to Purge Tank 255 Air Pressure Gauge – Trailer Suspension 256 Pressure Supply to Outside Lift Axle Controls XS _ Used for labeling extra air switches Airline Color/size Airline Number Airline Number Description Green/#10 101 Supply to service ‘A’ 151 Transmission - stationary / mobile control valve feed (s)