Rear self adjusting brakes

Brakes for your Classic Mopar

  1. dICKj

    dICKj Member

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    My rear brakes keep locking up. I've been told that the easy fix is to just take the self-adjusters off and use manual adjusting. Will this work? DickJ
     
  2. J Glenn

    J Glenn FABO Gold Member FABO Gold Member

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    Just curious, does this happen when backing up? One of mine locks up sometimes when I start backing up...
     
  3. dICKj

    dICKj Member

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    Yes, it does seem to be more backing up than going forward.
     
  4. Cuda Al

    Cuda Al Well-Known Member

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    Have you confirmed the shoes are installed correctly, primary vs secondary?

    Alan
     
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    • dano

      dano Evil Handy Man FABO Gold Member

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      The adjuster are left and right hand threaded and have to be on the corresponding correct side. Is it possible you swapped them or have two left or two rights?
       
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      • Dicer

        Dicer FABO Gold Member FABO Gold Member

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        Your brake springs should be check while its being inspected. the primary spring, is the last spring that should be installed on the pivot.....Rule of thumb, first spring you take off...last spring you put back on.......
         
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        • Tooljunkie

          Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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          And e-brake hanging up will cause adjusters to overtighten.
          And if the shoes are adjusted tight,good luck getting drums off. Will need to back off adjuster.
          Also axle seals and wheel cylinders, if theres a leak, brakes will lock up.
           
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          • Tooljunkie

            Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

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            Will work, but if they are operating correctly there would be no problem.
            And if adusters are on wrong side,they would back off the brakes. Best to have a workshop manual and investigate/repair problem. Until you remove drums its only speculation.
             
          • pishta

            pishta I know I'm right....

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            those adjusters get some pretty heavy crud and rust buildup on them. Maybe just a good hose down with brake cleaner over an oil pan.
             
          • toolmanmike

            toolmanmike FABO Staff Staff Member FABO Gold Member

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            Do they lock up the first few times you use them and then they are ok? You may have a wheel cylinder or axle seal leaking like @Tooljunkie mentioned in post#7. It doesn't take much of a leak.
             
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            • RedFish

              RedFish Well-Known Member

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              I can't imagine the adjusters causing lock up either. It's more common for self adjusting to not work at all. First vehicle I saw, and only one I've ever seen, that didn't have all the self adjusting bits in place was a late 80s Crown Vic', ex or retired police car. I was told they were delivered this way. The adjusting was part of routine maintenance. The new owner and myself too learned something that day.
               
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              • Dana67Dart

                Dana67Dart Most undignified way to get to Colorado!

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                Had a manually adjusted vw once. Would go too long between adjustments so I got used to double pumping the brake pedal to get brakes to stop the POS.

                Fix the issue no bandaids.

                Check that the area the shoe rides on, on the backing plate is not carved out in a pattern from decades of use, had a 65 Mustang with eratic braking till we repaired the backing plates.
                 
              • mbaird

                mbaird mbaird FABO Gold Member

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                Is this the original breaking system to the car ? If not it could have the wrong proportioning valve.
                If you installed front disc brakes on it this can happen.
                 
              • Garrett Ellison

                Garrett Ellison Amateur driver on public roadway, do not imitate..

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                Most dually trucks I have seen being worked on use manual adjusters. Mopar chassis manual recommends removing the automatic adjusters and using manual adjusters for racing applications to keep the shoes out of contacts with the during acceleration.
                 
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                • Mattax

                  Mattax Just the facts, ma'am FABO Gold Member

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