"If a little fountain of fluid squirts up out of the return port, there is still air."
That is true, but drum brakes that are not set up close enough also cause an extended return of fluid to the master cylinder after the pedal is released and the springs retract the shoes too far away from the drums, and the appearance is the same.
That is especially noticeable with an older, heavier vehicle with 4 large drum brakes.
Right now, I have a heavy 3/4 ton in the shop and we power-bled the snot out of it, and still had the large return of fluid.
Trouble was a stuck adjuster on the 13" drum brakes on the left rear wheel.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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