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1993 kenworth brake issues

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Moparjoe, Apr 12, 2017.

  1. Apr 12, 2017 #1
    Moparjoe

    Moparjoe Light Load Member

    93
    30
    May 3, 2014
    0
    Hey all. I have a 93 t800. Now a dump truck. Problem is the brakes are so touchy if you put 20psi pressure it locks up the rears. Ive adjusted them correctly. Says on dash equipped with a proportiining valve bla blh blah. Its scary barely touch the brake pedal and smoke show!! Any ideas
     
    Moparjoe, Apr 12, 2017
    Moparjoe, Apr 12, 2017
    #1
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  3. Apr 12, 2017 #2
    ClineER

    ClineER Light Load Member

    229
    139
    Apr 27, 2016
    N.E. Oklahoma
    0
    Check pressure to chambers compared to foot valve. The relay valve in back may be giving more than what you want from pedal
     
    ClineER, Apr 12, 2017
    ClineER, Apr 12, 2017
    #2
  4. Apr 12, 2017 #3
    Moparjoe

    Moparjoe Light Load Member

    93
    30
    May 3, 2014
    0
    It has a bp-1 valve and its giving it full pressure. I mean if its empty i touch the pedal it locks the brakes up
     
    Moparjoe, Apr 12, 2017
    Moparjoe, Apr 12, 2017
    #3
  5. Apr 12, 2017 #4
    ClineER

    ClineER Light Load Member

    229
    139
    Apr 27, 2016
    N.E. Oklahoma
    0
    Did you bypass proportion valve? That valve reduces pressure to rear brakes. You dont need one for a dump truck. But the rear relay valve. COuld be sending say 80lbs instead if 20lbs like your asking for. If you hook up a gauge and compare pressures it will tell you if relay valve is bad.
     
    ClineER, Apr 12, 2017
    ClineER, Apr 12, 2017
    #4
  7. Apr 12, 2017 #5
    Moparjoe

    Moparjoe Light Load Member

    93
    30
    May 3, 2014
    0
    No i havent bypassed it and it seems like its giving it alot of pressure. Dont know how to bypass it. My bp relay only has one sevice line to the top. Not sure whats going on i didnt build the truck. But when its empty its scary to hit the brakes fast.
     
    Moparjoe, Apr 12, 2017
    Moparjoe, Apr 12, 2017
    #5
  8. Apr 12, 2017 #6
    OLDSKOOLERnWV

    OLDSKOOLERnWV Captain Redbeard

    16,594
    246,043
    Nov 29, 2011
    West Virginia
    0
    Peddle a little stiff at first, then brakes engage quick and hard?
     
    OLDSKOOLERnWV, Apr 12, 2017
    OLDSKOOLERnWV, Apr 12, 2017
    #6
  9. Apr 12, 2017 #7
    Moparjoe

    Moparjoe Light Load Member

    93
    30
    May 3, 2014
    0
    No soon as you put your foot on it its lockin em up
     
    Moparjoe, Apr 12, 2017
    Moparjoe, Apr 12, 2017
    #7
    OLDSKOOLERnWV Thanks this.
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