JD 300b brake problem

hoosier1

New User
The brakes press all the way down and I have to pump them until they brake again. The reservoir is full. How do I check to see if the problem is in the brake reservoir or the wheels?
 

I'd suggest to bleed brakes at bleeder on the top of rear axle housing. Do brake pedals go down when both are pressed at the same time? I'd then suggest to plug brake lines then depress pedals. The valves inside the brake valve housing may need to be replaced.
 

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