One red is for supply and emergency fail safe application it fills tanks on the trailer and holds the parking brakes released.
Red and blue air brake lines.
If the driver were to cross the air lines supply air would be sent to the service line instead of going to charge the trailer air tanks.
Road king truck parts 15 ft nylon coiled air line set with gladhands and handles.
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Pick up a set of red and blue rubber air lines and know that they will last all the way down those long roads.
Air brake systems are three braking systems combined.
12 pair black rubber with red and blue emergency and service grips.
Red and blue rubber air line set.
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Red and blue rubber air lines available in 2 in 1 3 in 1 and 4 in 1 applications parts.
Coiled air set line assembly red blue truck trailer brake coil set 15 length.
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15 red and blue coil coiled air line hose set trailer brake 1 2 fittings.
One way to tell that this is the case is to listen for a large amount of air escaping from behind the red and yellow brake knobs on the dashboard.
2 x 12 leads.
Air would not be available to release the trailer spring brakes parking brakes.
Blue is used for the service lines and red for the emergency lines.
If you accidentally hook the air lines up backward the trailer will not move even with the brake knobs in the disengaged position.
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12 black rubber with blue service grip.
As per tony s answer they are air supply hoses known here as a suzy.
If broken or disconnected loss of pressure au.
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Reversing the air lines will remedy this problem.