About to replace the rotors and pads on my S2 and wondering about the shim plates.
I see there are a couple of styles according to the PET. Can anyone share some guidedence please?

 

Ok I guess I should be more specific. Anyone replace their pads without changing the shims? Any brake noise? I notice Porsche does not recommend any grease I guess because they expect you to use the shim plates. I'm leaning towards just leaving the shim plates in place and swapping the rotors and pads.

 

I don't recall the specifics but the difference between the M030 calipers with shims vs the anti vibration pucks is based on the month the calipers were built in the year the design changed which was 1989 IIRC.

When I rebuilt mine calipers I installed a shim plate and used a spray adhesive between it and the back of the pad, I don't recall if I used the adhesive between the shim plate and the caliper pistons, sorry. But, I would say if you're looking for quiet brakes use only OEM Porsche brake pads. I sourced mine from Sunset and after trying several other street pads found OEM to be the quietest and good for the street. When headed to the track I swap pads.

 

When you write "shims", you mean parts 23 and 24 in the PET?

I've just finished replacing pads all around on my '89 and was unable to locate either part. It concerns me since I'm the third owner of this car. Is it even possible for the braking system to work without these parts? I didn't use brake squeal silencing lube.

 

Shims are 17 & 18, they keep the pad from beating up the aluminum caliper.

Nos. 23 & 24 are little "flower" disks that go between the pad backing and the piston to reduce/eliminate pad squeal.

 

I had better luck installing the caliper over the rotor with the 'flowered' pads in place. kinda tight to pull the paper off with the pads seated on the shim plates. the cost of the rear 'flowers' on par with the oem pads so budget that expense.

 

To clarify, 17 & 18 are spring plates.

23 & 24 are vibration dampers & suppressors (pucks, as I called them) and vary in use by the month/year built.

The shim plates I was referring to I should have called backing plates and are similar in design to these... https://www.paragon-products.com/product-p/mc-6210.htm
Paragon Products also has the suppressors (pucks) available.

The turbo workshop manual goes into detail on replacing pads and the specifics about the dampers / suppressors / adhesives and grease to use.

Good luck.

 

I do mean part #23. They are for damping. I going to try and just leave them there. Worst thing that can happen is they squeak.
I just removed the rear brake pads on one side and the damper pads aren't stuck to the pads anyways and I didn't have any noise from my brakes.
Anyone have the torque values for the caliper? Can seem to find a turbo manual online.
Broke the brake sensors too so I need to order new one!

 

Both the front and rear caliper mounting bolts get torqued to 62.7 ftlb's (85nm).
Be sure to note the location of the washer/spacer on the rear calipers.

 

Spacer looks like it was between the caliper and the mounting plate.

 

Correct.

It's also a good idea to put a little copper anti-seize lube on the top and bottom edges of the brake pads where they contact the spring plates.

 

Will do! Thanks for the help!

 

You bet.
Car looks sharp.