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 - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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