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Sounds from brake drum

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Athame57:
I've been getting a long strange sound from the rear brake drum under gentle braking.  :o  This stopped a while after fitting new shoes  8)  but it soon started coming back again.  ::)  I'm wondering if the drum has started to go oval. Could that be the cause and can it be repaired?

Bryanj:
Only oval if the brake pedal pulses under your foot.
The noise could be dust in the drum

Athame57:

--- Quote from: Bryanj on June 17, 2025, 06:00:09 AM ---Only oval if the brake pedal pulses under your foot.
The noise could be dust in the drum

--- End quote ---
A bit of a relief, thanks Bryan. I have misplaced the dust seal I got of Julie, so it never got fitted. Maybe I should order another one off her when she gets back! :D 

exvalvesetdabbler:
A good clean up inside the drum, (Caution!!!! - do it with a wet cloth, bag and bin it as it might be asbestos dust), particularly in the void beyond the brake drum that seems to collect a lot of muck that might now have got dislodged and ended up between the shoes and the drum. Degrease the braking surface and shoes to remove any oily thumb prints.

Also worth checking that the new shoes have a decent chamfer on the leading edges.

If the drum has a wear ridge, the difference in diameter where the shoes rub compared to the edge of the drum that don't contact the shoes, it could just be the edge of the shoe rubbing on that before it drops into the drum under heavier braking. Only need the new shoes to be fraction of mm wider or offset than the old shoes.

On old cars with drum brakes it was a common theme and usually come down to grinding down the ridge a bit, and was sometimes a ball ache getting the drums off if the ridge had swelled up due to rust and the adjusters couldn't be slacked off enough.

I would give them a chance to bed in and hopefully the sound will go away.

Regards
Dave

Athame57:

--- Quote from: exvalvesetdabbler on June 17, 2025, 11:41:37 AM --- particularly in the void beyond the brake drum that seems to collect a lot of muck that might now have got dislodged and ended up between the shoes and the drum.

--- End quote ---
Thanks for this Dave, I never thought of that. I had better get the back wheel out again I think, I'll wait until I find this dust seal I have or get another one though.

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