I think there are about four of them, but sometimes more.
2006-09-13 03:44:43 · 19 answers · asked by Never say Never 5 in Cars & Transportation ➔ Other - Cars & Transportation
red line is the emergency air supply, it supplies air to keep the brakes on the trailer released when applied so the trailer can move, air pressure releases and is used to apply brakes.
the blue line is the service line and it is what engages the brakes , with air pressure, when the foot brake, or treadle valve, is applied. the green, sometimes black, is for the electrical , to operate the clearance lights, turn and brake signals on the trailer. it might appear that there are more when the trailer is close to the cab of the truck (lorrie) and they are somewhat tangled together.
2006-09-13 04:05:28 · answer #1 · answered by swa97s 1 · 1⤊ 0⤋
Glad hand coupling and seals are what connect the air lines to the trailer from the tractor
The Red line is the tractor emergency air line
this is where the air flows in when appling the brakes for the trailer .
The Blue line is the tractor service air line
which acts as an exhaust line or air return
The Black OR Yellow line is the power cord for the trailer to operate
lights and also a dump valve if the trailer is equiped with one...
2006-09-13 04:05:47 · answer #2 · answered by Vulcan 1 5 · 1⤊ 0⤋
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2014-09-25 11:20:07 · answer #3 · answered by Anonymous · 0⤊ 0⤋
there are usually 5 in total, two of them are air lines though,
RED airline is for emergency braking,
YELLOW airline is for seavice brakes,
Two electrical lines called SUZIES for lights and electrical equiptment on the trailer,
and an ABS line for trailers that have an ABS braking system.
sometimes lorries also have a BLUE airline which power auxillary air equiptment on some trailers
2006-09-13 03:57:15 · answer #4 · answered by Anonymous · 1⤊ 0⤋
They are air lines for the trailer's brakes and a connection for the lights. If they are not connected the trailers brakes will be on and the wheels won't turn.
2006-09-13 03:51:50 · answer #5 · answered by Gone 4 · 2⤊ 0⤋
service connections from the cab to the trailer,
air for brakes, electrics for lights etc
2006-09-13 03:54:09 · answer #6 · answered by Daddybear 7 · 0⤊ 0⤋
two are for the air that operates the service and emergency brake, two are for the electriccs for lights indicators etc and the last one is specifically for the ABS trailer system.
2006-09-13 03:54:10 · answer #7 · answered by SIMON G 1 · 2⤊ 0⤋
red pipe emergency brake supply
yellow pipe service brake supply
very thin cable(sometimes taped to electric line) for the ABS sensors.
other one(s) are for electric for the lights
hope this helps
2006-09-13 03:55:53 · answer #8 · answered by fatbadge 3 · 1⤊ 0⤋
Compressed air for the air brakes
2006-09-13 03:47:19 · answer #9 · answered by October 7 · 1⤊ 0⤋
air supply for the brakes and also power for the lights both at the rear and the running lights
2006-09-14 08:14:04 · answer #10 · answered by Auron 1 · 0⤊ 0⤋