Hi, quick fix is to bleed the right brake. Procedure is in owners manual also in archives for 454,574,674,684,484 and many other models have same brakes. The procedure can also be found in the archives. Check for leaking right brake cylinder under battery box and brake line leak that runs from brake cyl under cover over top of trans to under seat where it goes into top of diff by right rear axle. Probable cause as the other poster said leaking wheel cylinder O-rings.
Reason there are no brakes when both are pressed is there is an equalizer circuit between left and right brake all pressure will go to bad brake.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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