After working with tractor for about an hour a hissing sound starts from near the brake pedal. If you pump the brake pedal 3 or 4 times it goes away for a minute or two and then comes back. When the sound starts and you press the brake pedal it goes to the floor and after pumping it 3 times it only goes half way to the floor. Talked with dealer and they have not heard of the problem before.
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