Brake Drum Spec?

[71_Bronco 1,072]

On my 5060 transmission I'm rebuilding, I purchased a new brake band liner from our local RS member @rmaynard

 

The brake drum is part number 3902. I have the one that came on the 5060 transmission, as well as the one from the 5053 that is currently in my Commando 8 (the 5060 is going to get swapped into the Commando 8).

 

Is there a spec for the outside diameter I should need? Or do these drums not really wear with use? I dont mind putting new parts into this 5060 if needed, but I'm not sure how to tell if I need a new drum or not.

 

Thanks!

Edited May 13, 2020 by 71_Bronco

[ebinmaine 68,345]

 

 

As long as it's not rusted to perforation or the metal parts have been in contact with each other you should be fine.

[stevasaurus 22,863]

Right Eric...I have never seen any wear on the drum itself. 

[71_Bronco 1,072]

3 hours ago, stevasaurus said:

Right Eric...I have never seen any wear on the drum itself. 

 

Thanks. I wasnt sure if it was the friction material that wore, the brake drum that wore, or a combination of both. Kinda like the brakes on a car.

 

I'll just clean up the ones I have and mount the better looking one.

[ebinmaine 68,345]

Just now, 71_Bronco said:

 

Thanks. I wasnt sure if it was the friction material that wore, the brake drum that wore, or a combination of both. Kinda like the brakes on a car.

 

I'll just clean up the ones I have and mount the better looking one.

it probably is a combination of both pieces wearing to some extent just like on a larger vehicle.

 

On drum brakes I've never gotten too concerned about a groove or two.

Just clean up the drum of oil if there is any, and maybe scratch a light glaze on to the drum, at most.

 

Even if the drum itself doesn't have a perfect surface there is a large amount of contact area and the shoe will seat in a little if it needs to.