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JD 301A Brakes failed

1K views 2 replies 2 participants last post by  Johnleslie 
#1 ·
I have a JD 301A industrial tractor and the brakes completely went out. Pedals went to the floor.
The pistons on the brake valve body are stuck in.
Did the bleeding procedure as the manuals prescribed, but nothing
I am understanding that brake oil is derived from the main hydraulic system and is not isolated to its own.
I cant see where the oil comes in. Is it coming in from the valve body next to the brakes (reverser and clutch)
Seems with both pistons stuck in, there is an issue with the fluid coming in to the brake system.
Am I sniffing up the right tree here?
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#3 ·
Could they be held in by hydraulic pressure (vacume?) I was going to just pull the plugs at the check valves and clean what I could on the machine, but I was thinking the problem might be at the orfice where the oil feeds in from the reverser and might have to pull the whole valve body. Seemed odd that they both stuck and not just one or partial difference between them.
 
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