Low Air Pressure warning

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Krazy, Dec 9, 2022.

  1. Krazy

    Krazy Bobtail Member

    2
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    Apr 19, 2011
    0
    Guys, I don't usually post. I read the forums alot and spread the info I find here. You folks are better than a shop most of the time.

    I have a spare truck 2013 Cascadia. Sat for about 3 weeks. When I started it Tuesday the park brake warning came on even though set. Low air warning (buzzer and light) came on and stayed on even though at 125 Primary 130 secondary and dryer spit.

    From reading forum threads I figured I would get sensors. Replaced park brake sensor and both air pressure sensors. No luck. Got test light and there is no power to either side of wire to sensors. Does someone know where the wire originates from. Red wire with white line. Let me know what I can provide to help you help me.

    Any advice is greatly appreciated

    Karl

    Truck Specs
    2013 Cascadia DD 15 10 sp Not sure if VIN will help but last 6 is BR8293 If whole vin is needed let me know. I
     
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  3. North Pole Nightmare

    North Pole Nightmare Light Load Member

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    Dec 15, 2021
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    I would just cycle it a few times.Do a DOT airbrake test.See if the light and buzzer go off.
     
  4. Krazy

    Krazy Bobtail Member

    2
    0
    Apr 19, 2011
    0
    Ok, I aired it up and pumped down via foot pedal. No help. Aired it back up and drained it from tanks. Didn't help but at least I confirmed tanks are dry. Checked all fuses. Still no power to sensors. Put in another dash module to see if that might be problem. Still did same thing. I think it is a wire broke, or has been exposed and possibly ground out. But all fuses are good. Not much good at trouble shooting electrical.
     
  5. North Pole Nightmare

    North Pole Nightmare Light Load Member

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    Dec 15, 2021
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    Must be a broken wire somewhere.I move a lot of different trucks around,some have been sitting awhile.
    Sometimes a problem like that will clear itself after cycling the brakes a few times.Had one the primary gauge said 0 psi,secondary was at 125,air compressor ,dryer worked normal.No low air warning light or buzzer.
    Left that one for the mechanics to figure out.
     
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