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Red line no air

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by george_spr, Dec 19, 2017.

  1. Dec 19, 2017 #1
    george_spr

    george_spr Bobtail Member

    15
    4
    Mar 24, 2014
    0
    I have very little to none air coming of the red line. The blue one works properly. Tractor build air to 120psi, already changed the red/yellow dash valve. Today I changed the valve under the cab- the one from whom both (red and blue) hoses goes to the trailer gladhands. If I step up 3-4 times on brakes the brake pedal goes to the floor(loose air and its not active anymore even I have about 100psi on gauge) . The track is 99 Volvo with S60! Any help is appreciated. Thanks in advance.
     
    george_spr, Dec 19, 2017
    george_spr, Dec 19, 2017
    #1
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  3. Dec 19, 2017 #2
    Heavyd

    Heavyd Road Train Member

    7,750
    6,184
    Feb 4, 2009
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    Either the red line under the cab is blocked some where or the air supply to your tractor protection valve from your trailer park brake valve in the dash is blocked somewhere.
     
    Heavyd, Dec 19, 2017
    Heavyd, Dec 19, 2017
    #2
    CrappieJunkie and george_spr Thank this.
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