[Carl968]

Gentleman:

I am replacing front and rear pads on my "92 Coupe. I am having no issues with the current pads other than the fact that I want to install my Porterfield pads.

Fronts went well but when I got to the rears I noticed that there were no "vibration damping plates/discs for the pistons. PET indicates that PN 964 352 096 00 and 964 352 096 01 should be present at 4 each in the rear.

I have been driving on these pads for the past 9 years and have had no problems, vibrations, etc. I know that the pads were changed when I purchased the vehicle.

There is no evidence or marks on the backs of the pads that indicates that they were ever there. Also no evidence that any high temp grease was used between the caliper pistons and the pads.

The Porterfield Pads come with a plate covering the backs of the pads.

Has anybody else noticed this on their rear brakes?

Should I buy the "damping plates for pistons" as Porsche indicates or assume that the plates supplied by Porterfield will be sufficient?

Should I apply a thin coating of high temp grease to the area between were the caliper piston contacts the back of the pad/plate?



Thanks again. All opinions are appreciated.

Carl

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[flash]

there is supposed to be a plate in there.



never get grease anywhere near brakes. there are other compounds out there, and i have a couple here, but i have yet to try them. i'm going to mess with them on the SL550 soon though, as those are making noise.



be sure to replace your rotors. if you try to install porterfield pads on rotors that have had other pads on them, they will make probably noise and probably shudder.

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[Carl968]

Just to clarify Thanks Bob - so, are you saying that the plates that came installed on the back of the Porterfields are not enough and that I should install the, as Porsche calls them, "damping plate for pistons"? These are the discs that fit into each piston (p/n stated above).

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[flash]

i have never seen vibration plates on the back of the porterfields. it has always been just the friction material and the main plate to which it is bonded.

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[Carl968]

these definitely have a plate with tabs bent over the material backing plate. So, the pad has braking material, steel backing plate to which the braking material is bonded and the a thin plate that is attached to the back of the backing plate with bend over tabs. These are the Porterfield street pads.

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[flash]

interesting. of the 50 or so sets of those that i have bought, not one of them came with that. i have a set here in a box. no shim plates. no tabs. nada



is the part number for yours AP345?

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[Carl968]

yes

So what do you think? Should I install the damping disks along with these shims/plates or is that just overkill?

Carl

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[flash]

hmmm - no idea how you got those with damper plates. in 7 years of running them, on various cars, i've never seen that before.



i wish they had put them on the pads for the SL550. that is exactly the cure for the problem i am having.

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