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NH 8970 locking brake

jm Hey there you wise people, help me out!
My NH 8970 all of a sudden decides to brake on its own on the right rear wheel. When first starting it may go for 5-10 minutes, then the pedal goes rock hard and locks the wheel.
To get me out of trouble and operational, I have attached a hose from the brake bleeder nipple to the hyd oil filler so that the hyd oil is returned and the brake doesn't lock.
What is causing this?
I appreciate any input.
Thanks

sixbales I have no knowledge of your braking system, but in thinking about your problem I think you must have a sticking check valve somewhere in the system.

Probably in the master cylinder that the brake pedal actuates. Making it a one-way pump???

jm Thanks Sixbales, appreciate your help. Will follow this up and respond on outcome.
jm



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