brake shim ?

Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

Can any one tell me what is the brake shim for ? Confused

Its a thin piece of metal on the brakes close to the pads. (Well its off the ns125r front brake caliper).
It broke off the other day, but i took it for a test run with out it and the bike seemed okay,no squeeking,binding or lack of brakes.

WTF is it for, and does it harm the bike (or me !) by running without it ? Confused

Cheers

Richard (I'm having no luck with these brakes,first it was the pads,then the easyouts snapped in the fluid pot thingy and now its bits falling off ! I wish i never touched them ! ) moss
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ZRX61 · Victor Meldrew Joined: 05 Nov 2003 Karma :

It goes between the pad & the piston to *alledgedly* stop brake squeel....

swampy · World Chat Champion Joined: 04 Aug 2004 Karma :

As ZRX61 says, its meant to stop brake squeal, should also use copper grease on back of pads for the same reason, buggered if I know how it works though Thumbs Up

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Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

Liono · Spanner Monkey Joined: 22 Jul 2004 Karma :

On mountain bikes when you set the brakes up you "toe them in" by setting them so that the front of the pad hits the rim first, closely followed by the rest of it. This prevents (or reduces) brake squeal. Just a guess, as I don't have a clue about how it fits, but does the shim do a similar thing for your brakes?

Valentino Mossy · World Chat Champion Joined: 13 Jul 2003 Karma :

These are pic's from the dreaded haynes manual ! Sick

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Retro-Man · Traffic Copper Joined: 21 Aug 2004 Karma :

as the piston advances out it has a tendency to twist slightly the shim absorbs the resonation caused by this

as the piston returns in to the piston (It does this purely by a specially shaped piston seal) the shims take up any slack again preventing any squeak causing resonation..

the shims are only to be used with standard pads and a small smearing of copper slip (correct use of copperslip should leave a almost colourless smear).

some pads are available with a soft pad like backing already on the pad backing This type of pad does not require shims and in no circumstances should be copper slipped.

see my answer in the other post
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