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brake pedals are controlled by a lock pall attached near or on the pedal arm. This is the park brake part of a tractor. You may have to push the brake down and manually lift the pall out of the way as it will no automatically release.
OK, when the ABS module is unplugged, the same results. That tells me that the ABS system is not working properly.
Did they look into the master cylinder and other abs related components?
Any ABS codes on it?
If steering wheel shakes above 50 mph that's likely to be the tires on it, rather than a brake problem.
Have tires balanced and rotated and inspected for out of roundness that might cause vibration above 50 mph.
get the brakes to lock or stick then lift at least one wheel thats locking up. loosen the two bolts to the master cylinder and pull it back to see if the wheel frees up. if not crack one line at a time to see where the pressure is held....front , rear etc...
The drum brakes are to tight and they locked up have the druns adjusted or replaced, do not drive the car in this conditions as you can damage brakes, clutch and engine. All you can do to try to release them is pushing a couple of times the pedal. If you feel they are completely locked have a mechanic in site, or tow the car to a garage. If it unlocks check the brakes the same, it is likely they lock up again.