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John Deere Tractors Discussion Forum
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Brakes on 2940

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audie

04-26-2007 08:44:38




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i have noticed on my 2940 that i have to pump the right brake pedal for the brake to work. any ideas what this may be. the left brake works fine, but in order for the right brake to work i have to pump up the pedal. thanks




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deereford

04-26-2007 18:25:05




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 Re: Brakes on 2940 in reply to audie, 04-26-2007 08:44:38  
I had the same problem on mine. I found the oil intake hole at the top of the master cylinder was plugged with goop. Cleaned it out and it works perfect. Good luck!!



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audie

04-26-2007 15:12:21




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 Re: Brakes on 2940 in reply to audie, 04-26-2007 08:44:38  
thanks for the replies guys, i will try these ideas and see what happens.

thanks again



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WTW

04-26-2007 13:35:34




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 Re: Brakes on 2940 in reply to audie, 04-26-2007 08:44:38  
As Mike said try bleeding brake first as this can cause this problem. If after bleeding problem still exist, problem is most likely a warped brake disk located in rear axle assembly. What happens when disk becomes warped it become dish shaped and pushes brake piston in away from disk further than normal. To apply brake with a warped disk it will take more than one pedal stroke to flatten disk and part of another to build the normal pressure required to apply brake. Your problem is not your brake valve if brake pumps up and holds as it is doing what it was designed to do. The problem is it takes more oil volume to fill / apply brake than a normal one pedal / stroke can deliver due to increased piston travel caused by warped disk returning piston in too far. Hope you can follow what I am trying to say Good Luck, DW

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Mike M

04-26-2007 09:35:54




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 Re: Brakes on 2940 in reply to audie, 04-26-2007 08:44:38  
Have you tried bleeding them ? Do that first,then if it still happens you will have to rebuild the brake valve,then if you still have problems then the seal on the brake piston is leaking and you have to pull the axle housing to get to that.



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