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Brake chamber question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Socal Xpress, Sep 11, 2020.

  1. Sep 11, 2020 #1
    Socal Xpress

    Socal Xpress Road Train Member

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    Whats the difference square port vs round. Gc3030 standard stroke. Had #2 axle chambers replaced over 4 years ago and I ended up with 1 of each. Replacing the pair again and looks like both will be round. TIA
     
    Socal Xpress, Sep 11, 2020
    Socal Xpress, Sep 11, 2020
    #1
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  3. Sep 11, 2020 #2
    pushbroom

    pushbroom Road Train Member

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    pushbroom, Sep 11, 2020
    pushbroom, Sep 11, 2020
    #2
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  4. Sep 11, 2020 #3
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Wrench told me the long stroke are the parking brakes.

    True????
     
    Dave_in_AZ, Sep 11, 2020
    Dave_in_AZ, Sep 11, 2020
    #3
  5. Sep 11, 2020 #4
    AModelCat

    AModelCat Road Train Member

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    False I'd say. Square port just means they stroke 3" on a type 3030 vs 2.5" on a standard 3030.

    I hope I'm listing the correct stroke lengths. Its been a few years lmfao.
     
    AModelCat, Sep 11, 2020
    AModelCat, Sep 11, 2020
    #4
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  7. Sep 11, 2020 #5
    uncleal13

    uncleal13 Road Train Member

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    If you use a long stroke on a regular brake setup you may wind up camming over the S cams. Then you have no brakes. You cannot substitute Willy nilly .
     
    uncleal13, Sep 11, 2020
    uncleal13, Sep 11, 2020
    #5
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  8. Sep 11, 2020 #6
    HoneyBadger67

    HoneyBadger67 Road Train Member

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    Round should be short stroke, square should be long. The tag is probably long gone, but you can check for stamped indentifiers on the steel housing. Scrape off the rust and grease and read the stamping.

    FYI and very important: do not mix short and long on the same axle!
     
    HoneyBadger67, Sep 11, 2020
    HoneyBadger67, Sep 11, 2020
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  9. Sep 11, 2020 #7
    pushbroom

    pushbroom Road Train Member

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    A longer stroke brake pot cannot over cam brakes. The only way to over cam a brake is by severely worn brake shoes or drum.
     
    pushbroom, Sep 11, 2020
    pushbroom, Sep 11, 2020
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