Clunky Back Brake

weegieblue · Nova Slayer Joined: 21 Jul 2010 Karma :

Hey folks

I have a Suzuki En 125-2A and my back brake makes a big clunk every now and then when I press the pedal. It generally happens at higher speeds, and does not affect the actual braking at all. Once it's made the clunk, the brake acts like a normal brake thereafter, ie like a car brake, with the expected 'give'. Then later on in my ride, the same thing may happen.

The rear is a drum rather than a disk.

Does anyone know what this is off the top of their head, and any potential fixes? I keep scaring pedestrians so a fix would be nice although not a must I don't think.

Cheers

WB
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Suzuiki EN 125-2a - July 2010 to August 2010
Suzuki SV650s, 1999 model - August 2010 - now

Noxious89123 · World Chat Champion Joined: 10 Jun 2007 Karma :

The rear brake lever tends to clunk alot on my ladies gs125.
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flumpy7 · Could Be A Chat Bot Joined: 31 May 2008 Karma :

Could be cush drive rubbers

iooi · Super Spammer Joined: 14 Jan 2007 Karma :

How does the wear indicator look.... Bear in mind that its easy to move that back a spline, so it appears to have plenty of wear left. If you have not had the bike long.

Take it to bits and have a look inside, could be its just about worn the pads or something is sticking.
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Just because my bike was A DIVVY, does not mean i am......

Masked · Two Stroke Sniffer Joined: 02 Nov 2009 Karma :

Hello mate,

Have a quick look at the nut or bolt on the bar thing (sorry) that attaches to the brake. It's there to stop it spinning around with the wheel when the back brake is on, if it gets a little loose it'll start to clunk.

Circled the bit that I mean on the bike below, should be similar on your bike.

radical · Spanner Monkey Joined: 02 Jul 2010 Karma :

Op, the internal cam that opens your brake shoes could be dry and sticking, remove the rear wheel and remove the drum brake assembly (easy to do) clean the drum lining in the wheel from any dust and rust that may be there taking care not to breath in any of the dust then check the ca that opens the brake shoes for corrosion and lightly lubricate with a copper based grease such as copaslip, also check that the cam is rotating freely in the brake drum assembly and copaslip as needed. Check your brake shoes for wear and check that both ends of the shoes have a small taper, if not replace the shoes and dont be over doing the grease.

weegieblue · Nova Slayer Joined: 21 Jul 2010 Karma :

Cheers everyone. I'll start with Masked's slightly easier fix and then try radical's one if it doesn't work.

This will be my first ever foray into anything mechanical at all. Handy with the old DIY so should be fine. Everything's just a giant jigsaw - take the pieces off, put them back on again, easy as that, right?!
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Suzuiki EN 125-2a - July 2010 to August 2010
Suzuki SV650s, 1999 model - August 2010 - now

radical · Spanner Monkey Joined: 02 Jul 2010 Karma :

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

See if the wheel is tight, make sure the torsion arm between the brake and swing arm is tight. If all this is OK take the wheel out clean and examine the brakes, the liner can delaminate from the shoe and that is well bad when it finally comes loose and jams the brake on.
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