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John Deere Tractors Discussion Forum
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4320 Brakes

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Joe Wright

11-26-2006 20:01:39




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We resently purchased a 4320 and have a couple of issues that we need an expert to help us through. I have noticed that when pressing the brakes (left or right) the pedal seems to kick back. Also, it seems to be either all or nothing in braking as it is very easy to lock up the tires. Is there an adjustment that I can make? Is there air in the system? I"m not very familiar with this system, so any help would be greatly appreciated.

Joe

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msb

11-27-2006 20:46:43




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 Re: 4320 Brakes in reply to Joe Wright, 11-26-2006 20:01:39  
Sounds like the brake valve might need rebuilt.Could be a sticky equalizer valve, but that is the nature of the beast for some kickback to occur.Brakes should not lock up that easily though.



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Gerald J.

11-26-2006 21:09:41




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 Re: 4320 Brakes in reply to Joe Wright, 11-26-2006 20:01:39  
I believe the brakes are esentially the same as my 4020. There the brake pedal operates a valve and hydraulic pressure from the main pump actually runs the brakes. There is some bleeding that can be done according to the shop manuals. I learned quickly to not push on the brake pedals before I started the engine. There is something of a master cylinder to allow a brake application or two after the engine stops and that takes a lot of pedal motion. But when the engine starts and the hydraulics come up to pressure, no matter how hard I've pushed the brake pedals they ARE going to RISE all the way up.

The disk brakes are wet with transmission/hydraulic oil and oil not meeting JD specs can cause them to be noisy or grabby. And after a while to not work at all as the wrong oil can destroy the pads. Then repair is a real pain beecause the pad material has been distributed through the hydraulic system and getting to the brakes requires taking off each rear axle assembly into the reduction gear.

There are seals and such in each brake valve that can be rebuilt. Deere has a kit.

Gerald J.

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