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#4453418 - 07/08/17 01:02 PM Brake shims
supton Offline


Registered: 11/09/08
Posts: 11995
Loc: NH
What are these for, anyhow? The plate between pad and piston on calipers. Just another place for things to move around?

Kinda curious. I cheaped out on the last brake job, as i figured I could reuse the stainless parts. The clips that the pad ears go into were ok but turns out that my shims are two piece affairs--a stainless part and then something that rusted away. I scrapped away that which was rotted and installed just the thin stainless bit. On one side. The other side had both shims. No squealing, brakes seem fine (not that I'expect it to have issues braking).

I wouldn't think the stainless shim would slow down heat transfer, but could it be for that too?
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#4453431 - 07/08/17 01:16 PM Re: Brake shims [Re: supton]
doitmyself Offline


Registered: 06/03/02
Posts: 6231
Loc: MI
To my knowledge, they are there to dissipate vibrations/harmonics that cause brake noise.

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#4453633 - 07/08/17 05:41 PM Re: Brake shims [Re: supton]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Brake noise reduction. Use them.
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#4453638 - 07/08/17 05:48 PM Re: Brake shims [Re: Johnny2Bad]
supton Offline


Registered: 11/09/08
Posts: 11995
Loc: NH
Originally Posted By: Johnny2Bad
Brake noise reduction. Use them.


What if they don't make noise without them?
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2011 Toyota Camry, base, 2.5L/6MT, 162k, hers
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#4453665 - 07/08/17 06:20 PM Re: Brake shims [Re: supton]
CT8 Offline


Registered: 10/09/14
Posts: 11017
Loc: Idaho
Originally Posted By: supton
Originally Posted By: Johnny2Bad
Brake noise reduction. Use them.


What if they don't make noise without them?
What if ? All is good.
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#4453719 - 07/08/17 07:25 PM Re: Brake shims [Re: supton]
Ducked Offline


Registered: 10/25/12
Posts: 4388
Loc: Taiwan
Mine are similarly optional. They had rusted and displaced, so I threw the remains away when I rebuilt the brakes and didn't replace them.

Brakes are silent, though I probably wouldn't care much if they weren't.

I don't think brake noise is an inspection fail even in the famously anal UK.

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#4455344 - 07/10/17 02:42 PM Re: Brake shims [Re: supton]
ford46guy Offline


Registered: 06/01/13
Posts: 525
Loc: Albany, NY
I've seen them rust off. There was a sign in Autozone about a recall for certain pads that the shims fall out of place and cut the rotor thru that hat. Pretty scary.
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#4455524 - 07/10/17 06:02 PM Re: Brake shims [Re: supton]
SilverFusion2010 Offline


Registered: 06/29/11
Posts: 1663
Loc: Crawfordville FL
Noise control
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#4455959 - 07/11/17 07:54 AM Re: Brake shims [Re: supton]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
There are two different kinds of shims, as you noticed. The black coated ones are to dampen vibrations to reduce squeal, the stainless ones are to act as a heat barrier reducing the heat transferred from the pad to the caliper, and thus the brake fluid. Also prevents the dust boot on the caliper from getting cooked.
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