Squealing Rear Drum - Help before I go insane!

[herulach]

Having finally picked myself up a bike (YBR125 -2005) its developed an incredibly annoying squeal from the rear drum brake.

Any ideas how to go about sorting it? If it was a disc I'd say the pads where probably out of line (or at least thats what it would be on a mountain bike) but I don't think the same reasoning applies to drums.

[prawny1]

Cleaning the dust out and scuffing up the drum face will help along with giving all the pivot/contact points on the shoes and springs a light coating of copper grease/ anti squeal paste.

As a safety precaution use an aerosol brake cleaner to remove brake dust and catch the run off with a cloth to trap the dust, just in case the pads contain asbestos.
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hellkat wrote:

Some people are only alive cos its against the law to kill them.

[yvaiwhy]

check the springs...i had a similar problem with my bike..i grinded them a lil from each side with a die grinder and no it hasn't snapped off and still still going strong after an year also
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Don't break the speed limit, Just multiply it by 10 times and you will be fine

[yen_powell]

Take the back wheel off, lift out the drum. Tap out the brake dust, then wipe round the drum with a damp cloth.

Takes me back that does, my CG used to suffer with the embarrassing rear brake squeal.
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Blackmail is a nasty word........but not as nasty as phlegm!
XT1200Z and a DR350 in bits

[neil.]

As said, just needs a clean out and re-grease. Brake cleaner and kitchen paper are good for the drum. Roughen up the shoe surfaces as well. Also remove, clean and grease the cam in there as they do seize up if you neglect them. I use lithium grease on the cam where it rotates in the plate and copper grease on the part that is in contact with the brake shoes and also on the pivot opposite.
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[herulach]

Thanks guys,
I really should have just waited until my haynes manual came in the post today.

Just spent a very satisfying 2 hours faffing with it. Need to go buy a socket set to get the wheel off, but at least I've got the bodywork nice and shiny!

[neil.]

The Haynes manual, although great, lacks detail with regards to the rear brake plate assembly (how the cam fits etc) but the official Yamaha service manual for the bike is more thorough (I use both in conjunction with each other as Haynes tends to be more descriptive of how/why you do things whilst the Yam book is very to the point and 'instructive' but with little explanation of technique etc.

Grab it here: https://dl.dropbox.com/u/175946/YBR125ED_3D9-E0.PDF

Grab the parts catalogue here: https://dl.dropbox.com/u/175946/Moto-YBR125ED-3D91-2005.pdf
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CBT February 2008 | A2 June 2008 | Yamaha YBR125 (written off) | Honda CBF125 (current)

[herulach]

Thanks for that, the only one I'd found previously was in spanish, not that useful!