Case 1370 brake problem.

On my Case 1370, the left brake does not work. Right brake works fine.
The left brake pedal sinks fast when I press it down.
If I pump it fast several times, it brakes a little until the pedal sinks to the bottom again.

What part is most likely defect?
 
I take it bleeding it does not help? you may need to rebuild that side on the power brake valve,, maybe even the seals in the axle/brake
cnt
 
Is it most likeley that it is something wrong with the piston sealings, or the spool sealings?
Is it possible to remove tve piston backwards without removing the whole brake valve unit from tractor?
That would save alot of work if that is possible...

First of all, to make sure there is nothing wrong with the brake itself, I will disconnect and plug the line and press the pedal to see if it act the same way. If so, there must be something wrong with the valve.
 
Yes, I have the parts catalog, But my question is what part that most likely defect?
Is it the sealings around the spool (20) or the piston (28)?

And would it be possible to remove the piston backwards from the valve unit, inside the tractor, without removing the whole valve unit from tractor?
 
I have replaced some parts with them in the tractor,,, I unscrewed the hex nut where the brake line hooks to the valve,, been a few years, my mind is slipping
cnt
 

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