Service brakes don't fully release pressure

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mitmaks, Jan 14, 2019.

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  1. Jan 14, 2019 #1
    mitmaks

    mitmaks Road Train Member

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    So I've just ran into this problem. I was at stop light and then tried to leave on green. I felt brakes drag and notice my brake application gauge stays up a bit, brake pressure doesn't release all the way when I met go of brake pedal. I removed service brake line and it released built up pressure. If I pump up brakes, brake pressure builds up again and won't fully release brakes- brake lights stay on as well
     
    mitmaks, Jan 14, 2019
    mitmaks, Jan 14, 2019
    #1
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  3. Jan 14, 2019 #2
    SteerTire

    SteerTire Road Train Member

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    Hmmm. Check and make sure you don’t have the lines reversed.

    Or that someone hasn’t put a quarter in your gladhand.
     
    SteerTire, Jan 14, 2019
    SteerTire, Jan 14, 2019
    #2
  4. Jan 14, 2019 #3
    mitmaks

    mitmaks Road Train Member

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    Checked that. There is some moisture coming Out of service brake glad hand
     
    mitmaks, Jan 14, 2019
    mitmaks, Jan 14, 2019
    #3
  5. Jan 14, 2019 #4
    SteerTire

    SteerTire Road Train Member

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    Maybe you should drain the tanks ;)
     
    SteerTire, Jan 14, 2019
    SteerTire, Jan 14, 2019
    #4
  7. Jan 14, 2019 #5
    mitmaks

    mitmaks Road Train Member

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    Tanks are drained every night
     
    mitmaks, Jan 14, 2019
    mitmaks, Jan 14, 2019
    #5
  8. Jan 14, 2019 #6
    Arkansas

    Arkansas Medium Load Member

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    Brakes need adjusted.
     
    Arkansas, Jan 14, 2019
    Arkansas, Jan 14, 2019
    #6
  9. Jan 14, 2019 #7
    mitmaks

    mitmaks Road Train Member

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    If brakes need adjusted service gauge wouldn't show pressure. Btw brakes on tractor are disc and trailer has new brakes all around
     
    mitmaks, Jan 14, 2019
    mitmaks, Jan 14, 2019
    #7
  10. Jan 14, 2019 #8
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Most trucks today have the brake control valve in the floor. There is a piston between the roller on the pedal and the valve. Remove the pedal and clean all that out. Probably a lot more good advice in top right search block.
    Get the piston out. Clean it and the cylinder it fits in.
     
    BoxCarKidd, Jan 14, 2019
    BoxCarKidd, Jan 14, 2019
    #8
    SAR and AModelCat Thank this.
  11. Jan 14, 2019 #9
    mitmaks

    mitmaks Road Train Member

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    Now I'm thinking what if service line/blue somehow swelled up inside and holding air when I apply brakes?
     
    mitmaks, Jan 14, 2019
    mitmaks, Jan 14, 2019
    #9
  12. Jan 14, 2019 #10
    Bean Jr.

    Bean Jr. Road Train Member

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    I had the same problem. Both hand valve and foot valve. I never found out what the problem was.

    Out of curiosity, Peterbilt?
     
    Bean Jr., Jan 14, 2019
    Bean Jr., Jan 14, 2019
    #10
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