Would you reuse this rear brake drum?

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Any one else notice the spiral tool mark where the lathe operator just backed the Z axis out without moving the X?
 
Saw it and kept my council.

Had to think for a sec because was still contemplating the cam lobe thread.
 
jbruney said:
Saw it and kept my council.

Had to think for a sec because was still contemplating the cam lobe thread.
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If I was poor ( as in my very early motorbike days... ) I would have looked more at the sprocket teeth meat than the interior brake surfaces. Let's be honest , the rear drum brake is not up to the job without $pending. Buy new.
 
Pretty sure the somewhat blurry image is depicting the heat checking (cracking) axially in several places.
 
The right face of many of the teeth look like they have a consistent wear pattern to me.
 
I used dye penetrant on the suspect area of the drum:

After 10 min:
Would you reuse this rear brake drum?

After 15 hours:
Would you reuse this rear brake drum?

Going in the scrap bin.
 
Mine was cracked too. I binned it and bought new.
 
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That sprocket is smoked.
It will wear the chain FAST, which wears the front sprocket. Unless you're planning on only 100 parade miles per year, in which case, it'll last a while.
Would you reuse this rear brake drum?
 
Be aware, the replacement I got was poor quality, the staking of the drive lugs was incomplete/random, and the protrusion was too high. I had to peen, and grind to make it work.
Inspect carefully the new part.
 
NickZ said:
Meaning that as I rotate the rear wheel while lightly pushing on the brake pedal, I can feel friction for part of the wheel revolution and no friction for the rest.
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The consensus is to change it. I agree.

Focusing on a part of what you said, it sounds like the rear brake was not applied while tightening the dummy or one-piece axel (whichever you have). I would install new shoes and a new drum and it's important to centralize the shoes/brake plate while tightening the axel.
 
marshg246 said:
The consensus is to change it. I agree.

Focusing on a part of what you said, it sounds like the rear brake was not applied while tightening the dummy or one-piece axel (whichever you have). I would install new shoes and a new drum and it's important to centralize the shoes/brake plate while tightening the axel.
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Did all that. Much better now. Brake applies evenly now, but still have occasional squeal.
 
NickZ said:
Did all that. Much better now. Brake applies evenly now, but still have occasional squeal.
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Leading edges might need a little more relief (bevel), you may have the brake adjusted slightly too tight, or the brake not fully releasing - all assuming the squeal is when not breaking. If it happens when braking, I would take it back apart and clean very well to remove any grease or oil and sand lightly - you may be starting to glaze.
 
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