Well - below is a pic of what it used to be.
My brakes suddenly started to "jerk" - like it was an ABS
problem - but no ABS
Months earlier I had replaced both front calipers because they were starting to stick and get warm.
I thought maybe I had some air in the lines - so I bled, and bled, and bled the brake system - even the ABS
bleeder - but the jerking persisted.
I took apart the right rear brake drum - and found the culprit.
The self adjuster cable had broke - and the upper end of the cable still attached to the brake post was getting in between the shoe and the drum....
BUT - the other end of the self adjuster apparatus was also "occasionally" getting in between the shoe and the drum -
causing the "jerky" brakes.
Never heard of this one before... has anyone else?