928 S4 calliper re-build.?????

[Big Dave]

Hi All.

Im in the middle of rebuilding a set of 928S4/ 030 front callipers, that are going to be fitted to a 968......
+++
I need a set of pistons + seals to finish the job off.
Sizes are 44 + 36 mm respectively....

Does/ has any of you chaps done this job???
If so where did you get your bits from + were they the "right" price??????

Also i find the callipers / pistons i have are the ones "without the large dust seals", ie, some of them have the dust seals connected to the piston,in a groove .

How easy is/was it to remove these seals???????? Im finding mine are a "bit" stuck in......

Hope you can help
Dave W.

 

[Guest]

Thats going to be my winter project while the car is off the road, any tips will be more than welcome...

 

[Diver944]

I 'think' you're only choice is from Porsche.

As you know the callipers are made by Brembo and Bert Gear from Berlyn has stated a few times that they do have an agreement with Porsche not to supply any other retailers with spares [] He has tried.....and failed

It may be better just to but some new callipers from Porsche. I know some people have bought the 993 big reds and found them to be a reasonable circa £300. Surely the smaller S4 callipers should be less? Shop around, use the PCGB discount and try Adrian Oxley at Porsche Exeter first

edited coz I got his name wrong - cheers Fen

 

[Fen]

Adrian Oxley. The OPC used to be called Carr's

 

[Tony Daniel]

I replaced a set of leaking seals on one of the front calipers on a 944S2. I got the seals from Porscheshop for I think about £80( this is for 1 caliper).

Then in the winter I replaced the rest of the seals, in the remaining 3 calipers, this time from a OPC(Road Range). The seal kits from the OPC where cheaper and better! (included grease etc.)

None of the pistons needed replacing, they are stainless steel and just wipe clean, if your pistons are scored, then more than likely the bores in the calipers are damaged as well.

I also never found it necessary to replace the shims that slide in at each end of the brake pads, again these are stainless, any 'rust' was from the aluminium calipers and would clean off with some wet'n'dry

 

[TTM]

Brake pads dust tends to go in between the body of caliper and the metal plates in which the pads are maintained.
On the calipers of my S2 there has been so much dust there that the plates have gone out of shape and it is impossible to put in/pull out brake pads without taking the calipers off the steering knuckles, as brake pads don't slide at all anymore because of the metal plates maintaining them.
A temporary solution is to peel off some metal from the pads in order to narrow their width and allow sliding them into the caliper the usual way... not sure what I say is quite clear, though [8D]

All this just to say it is very important to fully clean the caliper at each pads replacement. Depending on the mileage of the caliper I think it would be safe to replace the metal plates for new items as well while everything is apart.