pro rider bike drum brakes

[garysnooker]

I have a problem with an excessive screeching noise from the rear brake when the brake is applied. It really is ear shattering! It also seems to be very "grabby"

 

[Nealh]

Look at the pads are they very shiny or low on wear ?
If very shiny try lightly sanding the surface or replace them.

 

[garysnooker]

Look at the pads are they very shiny or low on wear ?
If very shiny try lightly sanding the surface or replace them.

thanks nealh is it a big job to replace them.

 

[Nealh]

Drums doh, I should read things properly. Even so the same applies for drum shoes the surface may be very shiny or warn though the material.

 

[flecc]

I think we need a clear photo of a brake area to know what it is.

It's more likely to be a band brake or Shimano roller and ramp brake. True drum brakes with shoes and linings are as rare as hen's teeth these days.
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[Nealh]

I'm assuming it sounds like a scooter not unlike billybouyos one.

 

[garysnooker]

 

[flecc]

View attachment 46510

Thanks for the photo Gary, it's not one I recognise though. It's definitely not a drum brake with linings. It will be a metal to metal one like a roller and ramp type, hence the screeching. They need grease to stop the noise.

The Shimano one has an oiling hole and they sell the special type of grease for the job:

Roller brake grease

10 gms, Part number Y-041 40020

I can only suggest you investigate how to get access to the innards and grease as necessary with a high temperature grease. I can see that won't be easy with it on a hub motor wheel with motor cable entry on the same side.
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[garysnooker]

the only thing i found on the net was this do you think the grease goes in where that screw is

 

[flecc]

Thanks for the diagram Gary, so it is a band brake unfortunately, the worst for this sort of noise. That screw doesnt appear to do anything else so may be intended for adding grease but it would only apply grease outside the band. From there it would only spread to between the band and drum by luck as it got hot, but it's all you have so worth a try.

You need a high temperature grease, the small Shimano size doesn't seem to be available here and the dealer size one is too dear.
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[Craiggor 2]

I'm not a professional bike mechanic but I'm pretty sure you shouldn't be taking the screw out and putting greese anywhere near the band. There should be two screws with lock nuts, I think they are for adjusting the band. Looks like someone has been messing the screws are usually screwed out hence the need for the lock nuts. Your band is most probably worn.