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JD 400 Backhoe Brakes...

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bbott

12-09-1999 12:37:39

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A bit of a mystery on JD 400 brakes..

Push Portside brake... works fine...

Push ...Starboard brake goes to floor, but it will
'pump up' and then hold. Bled it, no changes.

Push both brakes... they both go to the floor...

I'd have thought possiblity of low fluid ? But it looks like the brakes get fluid from the main hyd resivoir...

Any suggestions as to what's haywire here ?

bbott

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Dave Wickman

12-09-1999 14:13:44

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Re: JD 400 Backhoe Brakes... in reply to bbott, 12-09-1999 12:37:39

I'll try to save the sinking ship, If you are sure there is no air in system and you can pump both pedals up and hold them without them settling your problem is not a leak or air. What you have is a warped brake disk on the side that the pedal requires pumping up. Whats happening is the brake disk that is supposed to remain flat when the pedal is released is warped like a dinner plate and is acting like a big return spring pushing the brake piston to far back away from it when the pedal is relased. When this happens it take more oil than normal or than what the brake valve can produce with one stroke to pinch the plate. To repair remove axle on side of concern and replace the brake disk. Good Luck!! Dave Wickman

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Steve

12-09-1999 20:20:35

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Re: Re: JD 400 Backhoe Brakes... in reply to Dave Wickman, 12-09-1999 14:13:44

Brake valve has a built in equalizer valve. Cap off the lines to the brakes, test valve again by pushing on one pedal then the other. If internal leak one will still go to the floor. Might be as simple as an adjustment of the stroke screw but I doubt it. If both pedals are solid, then the problem is in the axle.

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bbott

12-10-1999 13:05:40

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Re: Re: Re: JD 400 Backhoe Brakes... in reply to Steve , 12-09-1999 20:20:35

Thanks for the advice guys...

I'll try the equalizer valve first... as
getting into the axle and doing the brakes
is gonna be a headache/heartache/backache !

Probably why they hadn't been fixed for the
last 15 years !

bbott

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ROBERT

12-10-1999 22:43:10

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Re: Re: Re: Re: JD 400 Backhoe Brakes... in reply to bbott, 12-10-1999 13:05:40

each pedal has it,s own popit and the one on the brake in? may need a new one ROBERT

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bbott

12-11-1999 18:12:40

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Re: Re: Re: Re: Re: JD 400 Backhoe Brakes... in reply to ROBERT, 12-10-1999 22:43:10

Thanks...

I'll probably start takin' things
apart next week... long cold evenings
with not much to do outside anyway !

bbott

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