[sasilverbullet]

I replaced the pads on the rear last night...



Between the back of pads and the caliper were two round 'devices' that fit into the caliper pistons.



What the heck are these things? Never seen them on a car before!



<img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />

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[94SilverCab]

These are "Anti-Squeal" devices

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[flash]

those keep the pads in position relative to the caliper - they attach to the back of the pad via a glue - you really want those in there

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[sasilverbullet]

Yep, I put them in, and put some stuff the shop gave me. All seems well. No squeel, I bedded them in...and my pad light is out!



I was replacing the sensors on the rear wheels and noticed that ONE rear pad was worn down, so I put all new pads on the rear...

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[flash]

cool - best of luck - brakes are a good thing

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[ether_joe]

what sort of glue? any idea where I can source some?

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[flash]

no idea here - the replacement clips i used already had it on them

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[bob blackwell]

You can get it at any autoparts store. Pep boys, etc. CRC makes some and there are other brands too. Good luck, Bob Blackwell.

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[flash]

ooh - i need to check that out - i have a different application where i need a high temp glue - any idea what it is called?

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[sasilverbullet]

Hmmmm, the shop gave me a tube of:



Lubro-Moly - Anti-Seize compound ????????



And they said put a coating of that between the pads and the anti-squeel devices...so I did...it doesn't squeel.



??????Confused??????

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[flash]

yeah - wrong stuff for that spot, but the right stuff if you have shims



on the 2 968s i've seen the brakes on, those clip thingies glue onto the back and fit into the pistons - i've heard about shims also being in there, but have not seen them yet - the clips have always been glued right onto the pads on the cars i've done



anybody seen those shims?

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[968rz]

In the passed I’ve used high temp silicone for that purpose, not the right stuff but it works to hold the bracket in place and adds some anti-squeak properties.



Edit: BTW, Flash is correct (as usual) the Anti-Seize is only used for the parts that move (bolts, sliders....)

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[sasilverbullet]

Here's a pic that shows what i have on my rear brakes:





   

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[sasilverbullet]

The more I think about this the more it doesn't make any sense that I put the anti-seize between the shims and the pads. But that's what the guy at the porsche shop said to do...

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[968rz]

that WILL add some cushion between the pad and bracket but it's not right. get the correct glue or use high temp silicone.

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[sasilverbullet]

To clarify: So the goal is that the shim is 'glued' to the pad?

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[968rz]

right, this avoids any vibration and stops the shim from shifting.

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[Tom in Austin]

The concept is not to glue the pads per se, but to provide an energy-absorbing material between the pads and the anti-squeal/shims. Simply allows some controlled movement so vibration doesn't cause noise from bare metal rubbing bare metal.



The stuff's been around forever from many manufacturers. Spread a bead on an old brake pad (or anything else), let it dry, and you can see how it functions.

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[sasilverbullet]

I have a can of the 3m disc brake quiet. It's blue and you spray it on and it's kind of tacky...



Is that what I should have used on the back of the pads?

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[968rz]

Yes, thats what it's made for. Like Tom said, spray it on wait a few and put it all together.

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