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wobble after brake job

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I had a brake job done on the rear of my tractor 98 CH613 (new drums, shoes, hardware).  The truck wobbles now between 25-55 mph driving and gets worse when braking and it doesnt stop smoothly its very jerky.  I think I know the answer but not sure.  I'm guessing the drums are out of balance but the funny thing is it looked like they tried to balance them at the manufacterer as a small part of all four drums had a section ground off about 4 inches by 2 inches.  I got them from my Mack dealer and I never have a problem with their parts.

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Guess they tech did not road test it?

Out of round or out of balance, never saw the drums ground to balance, generally when manufactured they spot weld a balance weight on them. Grind marks to me say they had an issue and tried to static balance them in the shop.

Other thing is are the wheels and tires off when they were reinstalled. You can eliminate that by jacking the each pair on the rear axles up and turning them, use a jack stand or something to gauge if they are the cause when they are turned.

Edited by 41chevy
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I don't think an out of balance drum would make the truck wobble at 25 mph,out of round maybe,do what Chevy said look for wheel wobble by jacking up and turning the tires.

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1 hour ago, MACKS said:

I don't think an out of balance drum would make the truck wobble at 25 mph,out of round maybe,do what Chevy said look for wheel wobble by jacking up and turning the tires.

I reckon this is were I would start

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