Prophead wrote:
very nice job!
Where did you source the rebuild components from? I have 4 pot brembos on the front of my 924 track car (think they came from a 944 S2) and will be rebuild them over the off season.
Various sources as the bits I needed sometimes not in stock with any particular supplier.
Addiction Motorsports in East Ham good for Brembo original parts (I got bleeders from them).
Seals and dust boots were from Bigg Red in Worcester (excellent prices and service) and a German compnay nb-parts (find on eBay under that name). Bigg Red service is excellent - most stuff arrives next day. Both are using aftermarket rubber, but I had zero problems with it (some people have reported problems with aftermarket seals as the tolerances are very tight, and they've not been able to squeeze the pistons back in). Getting the right parts is a combination of knowing the sizes, and can help to know other Porsches using same sizes (e.g. I think Cayenne also uses the 28/30mm sizes used in rear S4 calipers, so can be easier to look for listings of these parts as Cayenne rear kit or similar).
Bigg Redd good for gathering all the parts into single kit. For example the front axle kit I needed is same as 996 Turbo (36/44mm). I can't remember if Bigg Red even listed a 928 kit, but I just ordered the 996 one which comes nicely packed with all seals needed, dust boots, and new bleeder caps, together with sachet of red brake grease which is much better to work with than brake fluid for lubricating the seals and pistons.
I think the Brembo rubber parts are at least double price of alternative. The alternative 36/44 front kit from Bigg Red was £55 for whole axle which I thought very reasonable. Smaller rears less than half that price.
In all my searches I hadn't found that company Mode Performance used by Waylander. I will make note of them for future too - all Brembo original parts.
You need to check which calipers your track car has, as the design of the Brembos used by Porsche changed around 1989 from having scraper rings round the dust boots, to a newer design which Brembo have continued to use to date, so it's pretty easy to get those more modern parts (my S4 is MY1991 so has those newer parts). The older calipers were the ones with raised lettering for Porsche, not just a flat decal/stencil so that's one way to check before even removing the pads to examine the dust boots. The caliper plates were assembled from 3 or 4 different sources including 9-apart and one-man bands on eBay. Your OPC can supply repair kits for the calipers once you've identified which calipers are on your 924, but they put on a big mark up onto the Brembo mark-up!
If you're not repainting calipers (I imagine you keep things functional on a track car!), then changing seals and boots is a pretty fast and enjoyable job. Just make sure not to scratch the piston bores when you're fishing out the square cut piston seals. I used metal pick so had to concentrate, but you could just use a cocktail stick and run zero risk! Once you're in swing of it you can rebuild a caliper in minutes really - the most time-consuming part is clamping different pistons as you use compressed air to push out whichever you're working on.
The difference with the rebuilt calipers is night and day in braking feel and power, and that's before the new pads and discs are properly bedded in.
If you don't have time to DIY then Addiction and Bigg Red both offer rebuild service. I also hear good things about a company called Godspeed based in Wales, but no personal experience or connection with any of these. I did look at rebuilding cost first, but the more I looked into what's involved, the more fun it looked doing it myself though any of these companies would have done a much better job of the painting than I could (they would media blast and powder coat I think).