Rear brake line fitting size/thread for replacement

Discussion in 'Suspension, Steering, Brake & Wheel Topics' started by Da_Raabi, Jun 12, 2017.

  1. Da_Raabi

    Da_Raabi Veteran Member

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    What is the correct replacement brake line fitting for the rear solid lines? I was trying to connect a set of 79 T/A brake lines (the ones with the big U-shape on the end) to a caliper and boogered up the threads on the fitting. I need to cut it off and re-flare with a new fitting, but can't figure out what size/thread it is. It's purple if that helps at all. It appears to be the exact same fitting that attaches to the front brake hoses, the rear brake hose T fitting etc.

    Thanks!
     
  2. Zspoiler

    Zspoiler Veteran Member

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    Its a brass "T" fitting from Dorman #785-436 Summit has it but most any Auto parts store or even a hardware store .In the brass fitting section. It might just be the same as the Camaro/Firebird It wouldn`t much sense for Pontiac to use a special fitting when they don`t have to,
     
  3. Da_Raabi

    Da_Raabi Veteran Member

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    Thanks for getting back to me, but I think I must have asked for the wrong thing. I'm looking for the fitting that goes on the solid line itself. It's purple and is what would screw into that T fitting. , you can't get it off of the line without cutting the line.
     
  4. Zspoiler

    Zspoiler Veteran Member

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    Is it the line itself? You can use AN type fittings or check some of the reproduction parts suppliers ,Classic industries ,the Firebird sites. Or take the hose to a Auto parts store NAPA ,Autozone ,etc .And try to match it up,
     
  5. falloutboy

    falloutboy Veteran Member

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    Pictures would really help here.
     
  6. 81BirdMan

    81BirdMan Veteran Member

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    The (purple) fitting on the hard line, which threads into the brass block (pic not mine).

    [​IMG]
     
  7. Zspoiler

    Zspoiler Veteran Member

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    You can take an open end wrench to check the size.Its an "old school"way of doing .I would in a pipe thread flared fitting because of the amount of pressure.I hope that help a little.
     
  8. falloutboy

    falloutboy Veteran Member

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    First of
    You don't need such a brass block

    Second
    The fitting depends on what kind of caliper or brake cylinder u actually use.
    Easiest way to find out is to look up ur caliper or OE brake cylinder (drum brakes)on rockauto . Open the info for that part. Look what inlet thread and sealing method it has.
    With this info go to ur local hardware / parts store and purchase the fitting.

    Remember if you replaced a part of the line you also have to buy a new line section. Fittings for old and new line to connect. Fitting to connect to brake
    AND
    Have a flare tool to make the needed flares.

    Tool might be for rent

    Hope this helps you now
     
  9. Da_Raabi

    Da_Raabi Veteran Member

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    Ohhhh kay. Looks like I need to explain here. I am cobbing together a rear disc setup using mostly OEM parts from a few different sources. I have brand-new OEM 1979 T/A brake lines, like the ones posted in the image by 81BirdMan. I am using 79 T/A backing plates as well, however I am using calipers from an 81 Malibu. They are essentially the same caliper, but they do not have the brass block, so I need to connect hoses to them so I can use a banjo bolt. So here is the idea:

    1. Stainless hose coming from the frame to the diff, has the T fitting on the end.

    2. Stock T/A solid brake lines (with the purple fitting on the ends) shortened up with re-flared ends (I have a flaring tool)

    3. Using weld-on brackets (below), welded to the axle tubes to keep the ends of the lines steady
    [​IMG]

    4. Stainless hoses from the lines to the calipers

    I've got everything I need for this on the way, I was just trying to figure out what the purple fitting is so I can get another one. I'm actually using the exact same brake hoses as the ones on the front, which kept things simple. Russell 672030 I think is the part number for the kit.
     
  10. Rick Figus

    Rick Figus New Member

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    Part UFP 32275
     

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