1958 430 Standard brake job

KYpatriot

Member
So I have weak brakes on this 430. Parking brake locks will not hold the tractor either. We pulled the right final drive and find that the brake pad discs are still thick, maybe 1/8 in less than new pads.

Any ideas why the brakes were weak? There is a bolt that attaches to the brake assemby linkage thru the pedal, it has a cone type nut like a lugnut. If I tightened that nut to bring the pedal up more would that also give a firmer brake engagement, or does that nut just change the position of the pedal?

Also the inner axle seal, the one on the differential side of the quill tore pulling the axle out. Looks like it is john deere part AM253T. Can I use a national 471192? That seems closest but cant find a cross reference.

Thanks guys
 
Most likely more glazed than anything. I would scuff the disks and plates, clean and lubricate the actuators and balls. The balls are 7/8 so if they're worn replace them.
 
Take the ex pander apart and check the condition of the balls and ramps. There shouldn't be any pitting on the balls or the pockets they sit in. Put a little bit of high temperature grease in each of pockets the balls set in. De-glaze the discs. The self energizing disc brake is a high maintenance unit.
 
I like to sandblast the removable metal plates to deglaze them.
Some places used to sell grooved facing replacement disks which seemed to work better too.
 

I will do all yall have suggested, except for the grooved replacement discs. Thanks for all your suggestions, really appreciate it.

I did find out that the lower right bolt penetrates to the wet side of the case. Figuring the axle seal sat above the fill level I didnt think I would have to drain the transmission. Wrong! Lol. Unfortunately the service manual I have covers the 420 more than the 430.
 

All finished. Everything works great, except it seems my hew brake springs, the springs that hold the pedals up, are too long. They allow the pedals to hang low enough that they are just starting to drag the brakes a little. About an inch too long. If ai adjust the brake adjust screw to let the springs take the full weight of the pedals, then they are low enough that the parking brakes do not engage firmly.
 

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