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2015 389 Peterbilt

Discussion in 'Trucks [ Eighteen Wheelers ]' started by KittyKicker, Nov 13, 2019.

Page 2 of 2
  1. Nov 29, 2019 #11
    KittyKicker

    KittyKicker Light Load Member

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    Dec 27, 2015
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    You mean just by disconnecting the batteries?
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #11
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  3. Nov 29, 2019 #12
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    May 4, 2015
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    You should have a master disconnect. Some trucks don't have them, Then yea disconnect the power.
     
    Dave_in_AZ, Nov 29, 2019
    Dave_in_AZ, Nov 29, 2019
    #12
  4. Nov 29, 2019 #13
    Goodysnap

    Goodysnap Road Train Member

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    Sure it could. Watch for the lights to go out while unplugged. If the sensor is reading pressure the CECU will leave the brake lights on if it shows pressure(which may not be there). With no way to monitor you will be left with swapping parts. Otherwise, take it in. I would check both brake application and service brake lamp switch. the gauge stuck at 50 is what is leading us to application transducer.
     
    Goodysnap, Nov 29, 2019
    Goodysnap, Nov 29, 2019
    #13
    KittyKicker Thanks this.
  5. Nov 29, 2019 #14
    KittyKicker

    KittyKicker Light Load Member

    196
    100
    Dec 27, 2015
    0
    Ok. I disconnected the brake switch earlier and with both wires taken off it still left the brake lights on. I will look for the other switch and get back to you.
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #14
  7. Nov 29, 2019 #15
    KittyKicker

    KittyKicker Light Load Member

    196
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    Dec 27, 2015
    0
    Alright. I met up with the driver and swapped the brake applied transducer with the secondary air transducer. The brake lights seem to be acting fine now, and lo and behold the secondary air pressure is reading 150! So it would definitely appear that the transducer was the problem. I appreciate your help very much and hopefully that was all there was to it. Thanks again, guys!
     
    KittyKicker, Nov 29, 2019
    KittyKicker, Nov 29, 2019
    #15
    Goodysnap and pushbroom Thank this.
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