Air brake issue, hearing a leak while pressing the break peddle.

Discussion in 'Questions From New Drivers' started by Chipperrr, Jan 22, 2021.

  1. Chipperrr

    Chipperrr Light Load Member

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    Nov 27, 2018
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    OK so with the truck parked. I can apply foot brake and I hear air leaking Heavily but can't tell words coming from?

    Any ideas?
     
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  3. 50WT

    50WT Bobtail Member

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    Dec 26, 2015
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    Bad brake can , or busted line.
     
    Bean Jr. Thanks this.
  4. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    Jam a stick or something between your seat and the brake pedal, then get out of your truck a listen.
     
  5. Dale thompson

    Dale thompson Road Train Member

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    You now get to play elimination logic. When you apply brakes it pressurizes the service brake system. This is all hoses valves and canisters. Start big is it the tractor or trailer. My second move would be to inspect the brakes looking for signs of inoperative wheel (rust on the drum is the biggest clue) hole in air line or bad diaphragm are your most likely suspects.
     
  6. 062

    062 Road Train Member

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    With the knob pushed in right?
     
  7. AKDoug

    AKDoug Medium Load Member

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    If parking brakes are released, the first place I look is the blue line to the trailer.
     
  8. God prefers Diesels

    God prefers Diesels Road Train Member

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    Jun 26, 2020
    South Texas
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    If you get out of your truck with the knobs in, don't forget chocks. Been enough threads recently with truckers getting ran over by their own equipment. Even if you have the brake pedal depressed with a board or something, you don't want to be under a tire when it slips off the pedal.
     
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