Trailer leveling valve leaking, is it a bad valve?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cajuncowboy654, Jan 19, 2021.

  1. Cajuncowboy654

    Cajuncowboy654 Light Load Member

    110
    32
    Jun 4, 2019
    0
    Would anything else cause a leveling valve on a trailer to constantly leak from the exhaust other than the valve being bad?

    I changed the valve on my 08 manac flatbed and even with the new valve it leaks from the exhaust. If I push up slightly on the arm it stops, then starts again when I let go. I've tried adjusting it but still the same.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. devedo

    devedo Light Load Member

    111
    40
    Aug 11, 2015
    0
    Does your suspension dump when you have the brakes set?

    otherwise, it should eventually quit when the suspension levels out with the rod.
     
  4. Cajuncowboy654

    Cajuncowboy654 Light Load Member

    110
    32
    Jun 4, 2019
    0

    No it is not an auto dump. Its leaks even with the brakes released.

    Guess ill have to get another valve and see if I got a bad one
     
  5. uncleal13

    uncleal13 Road Train Member

    3,223
    4,753
    Apr 9, 2009
    Humboldt, Sk
    0
    Mechanic changed mine once. Got two lines hooked up backwards.
     
  6. Cajuncowboy654

    Cajuncowboy654 Light Load Member

    110
    32
    Jun 4, 2019
    0

    There's only 2 lines for mine and I out them the same way I took them off.

    Would think if they were backwards, it would work backwards too
     
    uncleal13 Thanks this.
  7. uncleal13

    uncleal13 Road Train Member

    3,223
    4,753
    Apr 9, 2009
    Humboldt, Sk
    0
    It caused the air bags to raise but not lower, instead of draining the bags it just vented the supply to atmosphere.
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  • Draft saved Draft deleted