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Super MD Disk Brakes Banging

D

Dan MD

Member
When I first got this tractor, I had the motor overhauled and had the mechanic do the brakes also as the one side would lock up. I know he put in new brake pads and possibly some of the balls and hardware, not sure. I also remember him removing rust out of the grooves for the balls?

Anyway, my question is why do these brakes bang when I first engage them? It doesn"t happen everytime, but does it fairly often on both sides.

Thanks,
Dan
 
The first thought that comes to mind is the splined shaft the discs rid on is worn thus allowing the discs to move back and forth and bang into the worn splines when the brakes are engaged.
 
The steel surfaces of the inner brake drum, both sides of the actuator, and the bull pinion carrier, are worn from 60 years of use and abuse.

What's happening is the actuator is going past its limit, making the bang you hear.

The fix is to take the brake drum to a machine shop and have them mill the edge down. I don't know the spec off the top of my head, but with the two brake disks and the actuator stacked in the drum, lay a straightedge across the edge of the drum and measure down so many thousandths.

O.E.M. Tractor Parts used to offer this service IIRC. They would send you a replacement drum, actuator, and new disks milled to spec, and you would mail back your old drum and actuator as a core for minimal downtime, or you could send yours in.
 
I do know that .040 to 060 works on the M and up to 450, On C and H to 350 .035 to .055 seems to be OK. I do not know if there are repair specifications, but these work. Jim
 
I had a simular noise with my W6. the problem was the tire rims were not tight on the hubs thus the banging noise was caused when the rim moved to the stop.
 
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