4020 brakes sticking

Kory1998 · Aug 3, 2018

Believe brakes are sticking on 4020 went and shredded with it and after I got done with it was gonna back up to tractor barn when I let the clutch out to go into reverse it acted like it just jerked in revers it went into gear but when it was driving in reverse it felt like something was binding or catching. I had used brakes while shredding wanted to know what I need to do in order to get brakes un stuck.

This same tractor isnt the one I describe in the earlier post this tractor is my fathers 4020

4520BW · Aug 3, 2018

Sounds like the valve is leaking thru. Try
pushing the peddle down hard and fast a few
times. You can remove the brake lines and
start tractor to see if fluid is leaking
valve.

Bob · Aug 3, 2018

If (hydraulic system operated) brakes are sticking on a 4020, drag should be the same in forward AND reverse.

Are the pedals both fully "up" and equal in height?

Kory1998 · Aug 3, 2018

(quoted from post at 21:28:16 08/03/18) If (hydraulic system operated) brakes are sticking on a 4020, drag should be the same in forward AND reverse.

Are the pedals both fully "up" and equal in height?

Left one is hard too the touch right one is loose if you press down on it

Bob · Aug 4, 2018

(quoted from post at 23:38:24 08/03/18)

(quoted from post at 21:28:16 08/03/18) If (hydraulic system operated) brakes are sticking on a 4020, drag should be the same in forward AND reverse.

Are the pedals both fully "up" and equal in height?

Click to expand...

Left one is hard too the touch right one is loose if you press down on it

The brake valve DEFINITELY needs to be removed and overhauled, NOT too bad of a job.

HOPEFULLY, it hasn't been run like this long enough to damage the brake pads, sending debris into the transmission and hydraulic system.

DON'T run it any longer like this.

Also, drain transmission and remove transmission pump suction screen and check for brake debris.

IowaJohn · Aug 4, 2018

Put a guage on the brake lines coming out
of the valve make sure when you release the
pedal the pressure stays up. If it drops
immediately then the valve is ok. I have a
'71 ps that had sticky left brake, I went
ahead and had the valve overhauled and the
left was still the same. Put a gauge on it
and both sides released immediately. Ended
up new pads, o-rings, backup rings inside
the final drives. It's good now.

Kory1998 · Aug 4, 2018

(quoted from post at 09:45:29 08/04/18) Put a guage on the brake lines coming out
of the valve make sure when you release the
pedal the pressure stays up. If it drops
immediately then the valve is ok. I have a
'71 ps that had sticky left brake, I went
ahead and had the valve overhauled and the
left was still the same. Put a gauge on it
and both sides released immediately. Ended
up new pads, o-rings, backup rings inside
the final drives. It's good now.

Update on the tractor

Went and worked the brake valve back and forth noticed that if you press down all the way on the valve it dosent want to come back up the the deck it loose this was done with the tractor off
I had to kind of pull on them and work them to get them back to normal position, I figured well I can see if I got pressure to brakes while they are loose I left the left side loose started tractor and it shot back to normal position so I’m getting pressure to brakes
Next step is I’m gonna take off line and see if I got fluid leaking
Now I want to be sure about this
You do not want to have fluid leaking when the valve is not being depressed ? Correct

Bob · Aug 4, 2018

(quoted from post at 14:36:07 08/04/18)

(quoted from post at 09:45:29 08/04/18) Put a guage on the brake lines coming out
of the valve make sure when you release the
pedal the pressure stays up. If it drops
immediately then the valve is ok. I have a
'71 ps that had sticky left brake, I went
ahead and had the valve overhauled and the
left was still the same. Put a gauge on it
and both sides released immediately. Ended
up new pads, o-rings, backup rings inside
the final drives. It's good now.

Click to expand...

Update on the tractor

Went and worked the brake valve back and forth noticed that if you press down all the way on the valve it dosent want to come back up the the deck it loose this was done with the tractor off
I had to kind of pull on them and work them to get them back to normal position, I figured well I can see if I got pressure to brakes while they are loose I left the left side loose started tractor and it shot back to normal position so I’m getting pressure to brakes
Next step is I’m gonna take off line and see if I got fluid leaking
Now I want to be sure about this
You do not want to have fluid leaking when the valve is not being depressed ? Correct

Kory, simply loosen locknuts on brake bleed screws, then loosen bleed screws two turns.

This "dumps" brake pressure "to sump" internally.

Note whether or not the tractor acts different/the brakes release.

When done, snug down the brake bleed screws with the locknuts loose enough so the screw can bottom before the nuts get tight, then, when the screws are tight, snug down the nuts.

If you should accidentally unscrew the bleed screws too far, note that there is a steel ball in the port, that the bleed screw clamps down on.

Kory1998 · Aug 4, 2018

Do I need to do this with tractor running

4020 brakes sticking

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