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Brake shims #4453418
07/08/17 12:02 PM
07/08/17 12:02 PM
Joined: Nov 2008
Posts: 12,761
NH
supton Offline OP
supton  Offline OP
Joined: Nov 2008
Posts: 12,761
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?


2011 Toyota Camry, base, 2.5L/6MT, 170k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 144k, ours
1999 Toyota Camry LE, 2.2L/4AT, 195k, his
Re: Brake shims [Re: supton] #4453431
07/08/17 12:16 PM
07/08/17 12:16 PM
Joined: Jun 2002
Posts: 6,438
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,438
MI
To my knowledge, they are there to dissipate vibrations/harmonics that cause brake noise.

Re: Brake shims [Re: supton] #4453633
07/08/17 04:41 PM
07/08/17 04:41 PM
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Brake noise reduction. Use them.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Brake shims [Re: Johnny2Bad] #4453638
07/08/17 04:48 PM
07/08/17 04:48 PM
Joined: Nov 2008
Posts: 12,761
NH
supton Offline OP
supton  Offline OP
Joined: Nov 2008
Posts: 12,761
NH
Originally Posted By: Johnny2Bad
Brake noise reduction. Use them.


What if they don't make noise without them?


2011 Toyota Camry, base, 2.5L/6MT, 170k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 144k, ours
1999 Toyota Camry LE, 2.2L/4AT, 195k, his
Re: Brake shims [Re: supton] #4453665
07/08/17 05:20 PM
07/08/17 05:20 PM
Joined: Oct 2014
Posts: 12,567
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 12,567
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.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Brake shims [Re: supton] #4453719
07/08/17 06:25 PM
07/08/17 06:25 PM
Joined: Oct 2012
Posts: 4,825
Taiwan
Ducked Offline
Ducked  Offline
Joined: Oct 2012
Posts: 4,825
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.

Re: Brake shims [Re: supton] #4455344
07/10/17 01:42 PM
07/10/17 01:42 PM
Joined: Jun 2013
Posts: 525
Albany, NY
ford46guy Offline
ford46guy  Offline
Joined: Jun 2013
Posts: 525
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.


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: Brake shims [Re: supton] #4455524
07/10/17 05:02 PM
07/10/17 05:02 PM
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
Noise control


2010 Ford Fusion SE 3.0L V6, 181 miles M1 HM 10w-30
Re: Brake shims [Re: supton] #4455959
07/11/17 06:54 AM
07/11/17 06:54 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
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.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL

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