Left brake problems on 71' JD 2120

[Bejenaru]

Hi,

As you will read below, I have two issues with my JD 2120:
1. My left brake pedal operated does nothing in terms of tractor braking, but the right pedal brake works - what could be the malfunction cause for the left brake?
2. Second issue in fact is connected with the first issue, because when both brake pedals are connected I have no brake. My question is why the left pedal coupled with the right pedal influences the malfunction of the tractor brakes? because as I said above the right pedal works when is independently operated.

Thanks for help!

 

[Tx Jim]

When both brake pedal are actuated simultaneously this causes the equalizer valve to let oil escape to the obviously leaking LH brake piston seals. I hope your tractors leaking rear axle seal is on LH side.

 

[Bejenaru]

Yes, the leak is on real LH side. In this case is the valve which has to be replaced no?
But shouldn't the right brake still work when are actuated simultaneously?

 

[Tx Jim]

But shouldn't the right brake still work when are actuated simultaneously?

NO because the equalizing valve lets oil bypass from RH side of brake valve to LH side