not a clue

[pukfit64]

i was onmy way home today when my rear driver side brake began pulsating when i braked, when i got home i looked and found a hose not connected to anyhthing i grabbed it and it just feel off my truck, but it looks like it goes to a release valve on the drivers side rear axle, i tried to drive it again and it was fine but does anyone know what this hose or valve is or does thanks

 

[Gunner]

If it is connected your rear axle it is probably the vent hose for the axle to relieve pressure. If it is I suggest propping it up as high as you can with a zip tie or two.

 

[pinson27]

If it is connected your rear axle it is probably the vent hose for the axle to relieve pressure. If it is I suggest propping it up as high as you can with a zip tie or two.

Its either what Gunner said,or possibly a self bleeder hose for your brakes.