Another Rear Drum Dragging Thread

Brakes, Suspension, Rims and Tires

  1. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

    Messages:
    1,654
    Likes Received:
    2311
    Joined:
    May 13, 2015
    Location:
    Fargo, ND
    ‘68 Polara. Not sure that the spring is the issue. Here’s a picture of mine before I tore it apart in 2015. I most likely replaced these in the mid 80’s and put more than 20,000 miles on them before I parked it in ‘89. 3+ trips between Montana and Colorado in that time frame as well. Long spring on both. Replaced them with a another long spring during th rebuild and have close to 2,000 miles this summer with no issues.
    Before rebuild
    E8B319BD-EABD-4E42-BAC4-CAFA82700409.jpeg 411EE6D3-0ABA-4725-8E53-3B0C70B726C3.jpeg

    07260054-1698-4FF6-A7DE-9F61690EF587.jpeg
     
    • Agree Agree x 1
  2. 68PK21 440.6bbl

    68PK21 440.6bbl Senior Member

    Messages:
    4,085
    Likes Received:
    2166
    Joined:
    Nov 29, 2017
    Location:
    Siren City FL.

    Well you can argue all you want about having 2 secondary springs on your brakes (wrong) I could care less, what I think you need to do is go learn about the brake basics.



     
    • Thanks! Thanks! x 1
  3. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

    Messages:
    1,654
    Likes Received:
    2311
    Joined:
    May 13, 2015
    Location:
    Fargo, ND
    Great video, a must for first time brake rebuilders. And a good review if you haven’t done it in a while. More informative than any modern YouTube video.
    No mention of spring length or placement. In reality it shouldn’t matter. Short spring in a closer hole should have about the same force as a longer spring in a farther away hole. One could argue leverage Could be better with the short spring, but should not contribute to dragging brakes.
    If the short and long springs were that important they would have covered the theory in the video. Key is to have properly dressed backing plates and shoes.
     
    • Agree Agree x 1
  4. 68PK21 440.6bbl

    68PK21 440.6bbl Senior Member

    Messages:
    4,085
    Likes Received:
    2166
    Joined:
    Nov 29, 2017
    Location:
    Siren City FL.
    I think you didn't pay attention to the "Self Energizing Action" segment or are you a engineer of these braking systems? Watch some of the other Master tech videos on drum brakes, they cover the drums up to 1977.
     
  5. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

    Messages:
    1,654
    Likes Received:
    2311
    Joined:
    May 13, 2015
    Location:
    Fargo, ND
    Still no mention of spring importance on the "Self Energizing Action" segment.
    If you are assuming that because of the rotation of the secondary shoe rotating down and away from the anchor the longer spring has a better chance of getting hung up on the brake cylinder and not returning as easily as a shorter spring then else, then I could give you that. But if that was the case your brakes could also hang up if you brake in reverse as now you are relying on the longer spring which is also rotating down to return to the anchors.
    Whether or not they came out of the factory this way the main point is that the springs are probably not the issue unless they are loose and worn out. If that was the case I should be having brake issues.
     
    • Agree Agree x 1
  6. rkrochen

    rkrochen Well-Known Member

    Messages:
    530
    Likes Received:
    331
    Joined:
    Jun 29, 2015
    Location:
    Teulon, Manitoba
    Was trying to ignore this thread but had to jump in. Different shoe and hardware manufacturers utilized different springs. I have had to put the long ones on myself with no issue. What is important here is the strength of the spring not the length. It makes no difference as long as the hardware is good and both sides are the same.
     
    • Agree Agree x 2
  7. Pauly's67Polara

    Pauly's67Polara Member

    Messages:
    51
    Likes Received:
    15
    Joined:
    Nov 28, 2011
    Location:
    Colchester, VT
    Hey guys, sorry for absence, job travel & sick family member...but here's an update...nothing worked. Still hot. Used the correct shorter size primary spring from the 1974 Grand Torino Raybestos H7071. Fit into that upper hole. Shoes return better, more efficiently I would say, but still hot. I'll let you know what I decide to do, discs etc. She's in storage for winter now, but working on my brother's 318 car now.