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Parking brakes will not hold.

Discussion in 'Peterbilt Forum' started by Texas_incognito, Dec 12, 2012.

  1. Dec 12, 2012 #1
    Texas_incognito

    Texas_incognito Light Load Member

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    Oct 9, 2012
    Texas
    0
    2005 Peterbilt 379. The parking brakes on the tractor will not prevent the truck from rolling away. The brakes are in adjustment and the brake shoes and brake drums are in compliance. Is it possible for the spring to weaken with age preventing the shoe from being applied firmly to the drum when the parking brake is set?
    I got DOT'd yesterday and they did not find any problems with the brakes on the truck. On the axle where the parking brakes are located, the left push rod travel was 1/2 inch and the right was 3/4 of an inch, both were in compliance.
     
    Texas_incognito, Dec 12, 2012
    Texas_incognito, Dec 12, 2012
    #1
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  3. Dec 12, 2012 #2
    bender

    bender Road Train Member

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    Jul 20, 2010
    Don't Kid Yourself
    0
    You most likely have broken springs in one or both parking brake chambers, not applying full spring force to hold the truck.
     
    Last edited: Dec 12, 2012
    bender, Dec 12, 2012
    bender, Dec 12, 2012
    #2
    Texas_incognito Thanks this.
  4. Dec 12, 2012 #3
    freightlinerman

    freightlinerman Road Train Member

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    Mar 4, 2011
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    I have a similar issue with a bus with DD3 chambers. My issue, the brakes appear to be adjusted but, I have no park/service/emergency function. The mechanic was stumped.
     
    freightlinerman, Dec 12, 2012
    freightlinerman, Dec 12, 2012
    #3
  5. Dec 12, 2012 #4
    stranger

    stranger Road Train Member

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    Might want to check the S cam bushings along with the cans.
     
    stranger, Dec 12, 2012
    stranger, Dec 12, 2012
    #4
  7. Dec 13, 2012 #5
    truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
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    You need to make sure when you set the brakes the.air is released might have a bad relay valve or quick release valve not letting the air from the emergency side of the cans
     
    truckmechanic, Dec 13, 2012
    truckmechanic, Dec 13, 2012
    #5
    Sheldon#1 Thanks this.
  8. Dec 30, 2012 #6
    CTE

    CTE Bobtail Member

    8
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    Dec 30, 2012
    0
    I had the same problem on a truck and never did figure it out. The crazy thing was it had the best feeling brakes of any truck I had ever driven it was a 90 379 dump truck but the parking brakes wouldn't hold good at all.
     
    CTE, Dec 30, 2012
    CTE, Dec 30, 2012
    #6
  9. Dec 30, 2012 #7
    Bent Wrench

    Bent Wrench Medium Load Member

    588
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    Aug 11, 2009
    Cornholio, OR
    0
    Ditto: the broken Maxi spring

    Keep the cage bolt hole covers on that will keep them clean and last longer.
     
    Bent Wrench, Dec 30, 2012
    Bent Wrench, Dec 30, 2012
    #7
  10. Dec 30, 2012 #8
    d281833

    d281833 Heavy Load Member

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    May 15, 2012
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    Springs broke in the pots, I had 3 out of 4 gone. Brakes worked fine, parking didn't.
     
    d281833, Dec 30, 2012
    d281833, Dec 30, 2012
    #8
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