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Brakes grabbing on 97 peterbilt 379

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Nestor, Jun 4, 2018.

  1. Jun 4, 2018 #1
    Nestor

    Nestor Light Load Member

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    Oct 21, 2015
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    I’m having trouble with my brakes on my peterbilt . They seem to be grabbing here and there. I have to press brake again so it can release . It’ll stop my truck if I’m coasting or if I’m at a stop light it’ll just stay there till I let go n re press brake then it’ll roll .when I press my brake my air brake gauge goes up to 90 then drops down to 30 pretty fast . There way to sensitive also .
    The truck is a tandem axle dump truck I converted it last year . I’m not real sure if they changed that brake poroortioning valve in the back of the 2 axles .
     
    Nestor, Jun 4, 2018
    Nestor, Jun 4, 2018
    #1
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  3. Jun 4, 2018 #2
    Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    First place to go is inspect the brake pedal pin for being frozen. After that it is likely the plunger in hanging is the top of the treddle valve or foot valve. The plunger and the boot are available separately and should be in stock at every pete dealer in the country. Sometimes all it takes is disassembly and a thorough cleaning and lube of all parts. On older trucks, I've had to replace everything including the valve and pedal, mount.
     
    Goodysnap, Jun 4, 2018
    Goodysnap, Jun 4, 2018
    #2
    spsauerland and Cam Roberts Thank this.
  4. Jun 4, 2018 #3
    Cam Roberts

    Cam Roberts Road Train Member

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    May 13, 2018
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    Dam I went through this as well. I just did this procedure on my 379. The whole brake pedal mount was in very bad shape. The holes were elongated and the pin was completely frozen in the brake pedal itself. 2 bolts that go through the mount and into the valve snapped off. I was able to drill the balance and retap new holes through the bolt holes while still installed on truck. I put anti sieze on the new plunger and everything is smooth and feels like a whole new brake pedal.
     

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    Cam Roberts, Jun 4, 2018
    Cam Roberts, Jun 4, 2018
    #3
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