Air break leak or?

Discussion in 'Swift' started by Oaktown, May 18, 2013.

  1. Oaktown

    Oaktown Light Load Member

    Dec 19, 2012
    Hi guys, my question is in the a.m. or after
    A Ten hour .break etc. primary and secondary air tanks have gone down to 0 psi , and low air warning lights are on. Does this indicate a slow leak? Does this call for the dreaded shop visit?. Truck 08? Volvo 670 500k miles, appears in good shape, well maintained.
    Last edited: May 18, 2013
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  3. NoBluffBuff

    NoBluffBuff Light Load Member

    Apr 4, 2012
    Northern Idaho
    This only happens when hooked to a trailer or with the tractor itself?
  4. Balakov100

    Balakov100 Road Train Member

    May 10, 2012
    Temple, TX
  5. boneebone

    boneebone Road Train Member

    Mar 13, 2009
    It's not necessarily a "air brake" leak, it's just a air leak. It could be coming from any number of places. The best thing to do is to get it into a Shop ASAP.
  6. Oaktown

    Oaktown Light Load Member

    Dec 19, 2012
    Yes, hooked to s trl. Old banged up piece piece if &^/$
  7. kw600

    kw600 Road Train Member

    Dec 9, 2011
    Check your red and blue glad hands and couplers. It could be your air bags themselves; best bet is to take it to a shop; better safe than sorry
  8. snowwy

    snowwy Road Train Member

    Jul 6, 2009
    next time you park. pull both your brake valves and see if the leak slows down. that can tell you if its in the truck or the trailer.

    i always run pretty close to empty when i leave any trailer open. pull both valves and i'll still have enough to start driving without waiting for pressure to build back up. course, if it's winter. i'll let the truck and oil flow warm up a little first.

    your trailer might be perfectly fine. but keeping the RED glad hand from slowly draining is a hard thing to do.

    red is supply, air always flows through. blue is the return and only has air when brakes are applied.

    losing air is not uncommon. fire engines fire there trucks up every few hours to keep the tanks pumped up. can't have a emegerncy with empty air tanks. that truck needs to roll IMMEDIATELY.
  9. flood

    flood Road Train Member

    Dec 25, 2010
    it's a Volvo and they are known for having air leaks.....

    to check the air line going to the trailer (that's not where it's leaking) unhook the red air line and put the red glad hand in a bucket of water (this after you pull the red knob) you will know if it's leaking...

    having a air leak is no fun but as long as it passes the pre trip air brake test it's OK........ if it builds up fast when you start the truck it's not a bad leak..... if you can't hear it it's not bad.... and if you can't see the psi dropping when it's running it's not bad..... you need to get it fixed but as long as the compressor isn't running more than every 5-10 min you'll be fine for now....
    Tapeworm and Frenzy Thank this.
  10. Noggin

    Noggin Road Train Member

    Apr 10, 2011
    Houston, TX
    I like snowwys idea... next time you break, set your trailer brakes also. After the 10 hour break, If the air pressure is still built up, (which it probably will be) problem is with trailer. Still needs to go to shop, but you know it's somewhere on trailer. If pressure still drops, you know it's on truck, since air flow to trailer was blocked off
  11. Bikerboy

    Bikerboy Light Load Member

    Apr 1, 2008
    Blue is not a return, it only has pressure from tractor when service brakes are applied.
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