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Help! JD 400 backhoe brakes

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marshall

04-06-2003 18:15:11




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I got no petal at all in either side . I replaced the brakes in the rear ($800) both sides i replaced all the O rings in the valve and i bleed the brakes forever until there was no air, all new fluid and filters no matter what i do no petal at all! pushes fluid fine out the bleeder but if you put your finger on it, it dosn't seem like there is any pressure.even if i take the line off at the valve and put my finger there,finger off it blows the fluid 5 inches.ANY suggestions?

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davidval

04-07-2003 07:06:41




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 Re: Help! JD 400 backhoe brakes in reply to marshall, 04-06-2003 18:15:11  
did you replace the packings on the brake pistons?
anyway to check where the leak is, simply disconnect brake lines at the brake valve, cap the openings )on the brake valve!) and press pedals: if pedals are high and do not move when depressed a few inches, then lhe leak is at the brake pistons. if the pedals go all the way down, Then the fault is in the valve.
david



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chris

04-06-2003 19:48:28




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 Re: Help! JD 400 backhoe brakes in reply to marshall, 04-06-2003 18:15:11  
Have you gone through the brake valve yet, sounds like the check valves have something in them or not seated properly. It's been a while since I did one try a search with the forums to see if you find anything. I've helped a few guys with this problem before on this site. Write back if you can't find anything. Removing the top plugs pipe/frost plugs help to see whats going on. chris



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marshall

04-08-2003 15:33:27




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 Re: Re: Help! JD 400 backhoe brakes in reply to chris, 04-06-2003 19:48:28  
ok here is what i did . I unhooked both brake lines at the valve and plug them took out the plug on top to look in valve its full of fluid when i start to pump to petals. as i pump them either one at a time or both together I dont build any pressure at all and it pumps the resivior dry I can fill it and it will just disappear into the checkvalve I checked for leaks on the valve body as i pump it and find nothing i replaced all the O-rings in the valve. WHERE IS THE FLUID GOING?

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