Posted by Jim.ME on February 24, 2021 at 03:53:31 from (67.242.178.40):
In Reply to: J D301a brakes posted by randy1 on February 24, 2021 at 02:10:59:
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Do you have the John Deere technical manual for this tractor? From your question, I am guessing you don't. You really should have the technical manual (TM1088) for the 301A to go through the diagnostics and make repairs.
Your brakes work off the tractor hydraulic system. The pedals are connected to valves that send hydraulic fluid through lines to apply pistons which apply wet brake discs inside the axle trumpets. There are no adjustments other than a few related to the pedals to be done when the brake valves are overhauled. What do you run for transmission hydraulic fluid? It should meet the current J20C spec, like Hy-Gard. (J20A (older Hy-Gard) might be ok at the 301A vintage, 303 or any UTHF only saying they are equal to or meet 303 specs are not ok.) Wrong oil can ruin the brake discs, which break up and can plug the transmission screen and plug the filter.
You may have problems in the brake valve(s). You can try bleeding the brakes, but that likely won't cure it. Isolate the brake valves from the brakes (disconnect and plug the ports where the lines go to the brakes). If the leak down stops (pedal stays solid), the problem is in the brake assemblies in the axle, if it doesn't it is in the brake valve(s). There are several possible things it could be in the valve(s).
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