Bill Ball

One other thing we did during the rebuild was CLEAN the dirt and brake dust off the hardware, and Dan comments on how that can be important. Did we do that to the other side that we did not rebuild?

BC

The spring plates, as Dan refers to, are indeed imporant. If there is enough resistance in them on the pads, only the more-easily-pushed pads may move. When I had the calipers powdercoated, I took the spring plates and had them nickel plated, and replaced the button screws with stainless steel hardware.

928autobahndreamer

Has anybody ever sourced a kit to rebuild 87 calipers. This is on my to do list, but I have heard that they are NLA. So, right now the plan is to disassemble and clean and reassemble.

jheis

I've got this problem on my car (86.5 brakes off of a New England car). Pads are almost impossible to insert (or remove). I just checked yesterday and almost ALL of the wear is on the outside pads - inner pads look new.

I recall reading somewhere that the screws holding the stainless steel plates to the calipers are almost impossible to remove without destroying them. Any one have any tips - I'd hate to have to try drilling them out....

James

ckabee1

I am in need of a caliper rebuild kit for my 86.5. Anyone know where these can be found for the later cars?

BC

truechoice.com

The button screws are indeed destroyed. But easy to replace once out. It involved a hammer and chisel.

hacker-pschorr

Found the links, from this thread:
https://rennlist.com/forums/928-forum/263300-brake-caliper-pistons-help.html

Kits:
http://www.allzim.com/acatalog/Bremb...ust_Boots.html
http://www.zeckhausen.com/Brembo/Con...es.htm#Rebuild

Paul D

Ck - I rebuilt a set of 86.5 calipers back in 2004. I only bought the pressure seals as the cylinders and pistons looked good (no scratches, visible wear). I bought them through Stoptech. The '86.5 MY calipers are unique in that they use a scraper ring type dust boot instead of the more normal bellows type dust boot. I was not able to find anyone who sold the scraper ring type boot seperately so I just cleaned the originals (didn't even remove them as it appeared to be a destructive process). Otherwise you will have to go to the dealer and purchase a rebuild kit (if they are even available for that MY) which includes all the pressure seals, dust boots and pistons for big bucks. Here are the sizes for the pressure seals:
Qty = 4 42mm pressure seals.
Qty = 4 36mm pressure seals.
Qty = 4 30mm pressure seals.
Qty = 4 28mm pressure seals.
They are approx $8 - $10 a piece so it's not trivial. It's good peace of mind maintenance though. Good Luck!

928autobahndreamer

Am I correct that 1987 S4 brakes also use this same scraper vs dust boot set up? So if I were to get the pressure seals it would cost about $150?

ckabee1

Thanks for the links.

Qty = 4 42mm pressure seals.
Qty = 4 36mm pressure seals.
Qty = 4 30mm pressure seals.
Qty = 4 28mm pressure seals.
They are approx $8 - $10 a piece so it's not trivial.

Yikes! This may have to wait until I sort out my suspension and A/C issues.

I'm going to look through PET now, but are there 4 different size pressure seals per caliper? I haven't looked, but I guess I just thought all 16 pistons/seals were the same size.

Paul D

CK - There are 2 different sizes per caliper. 42 / 36 are fronts and 30 / 28 are rears.

928Dreamer - I beleive that the scraper seals are a 86.5 model year only feature. You will want to verify by looking at your calipers though.

Ninespub

IIRC there was a firm that took late model 928 Brembo calipers (inc. GTS) and rebuilt them (including repainting?) for a relatively low price. It may have been an exchange/core thing, I'm not sure anymore. It sure would seem to be a lot less grief & aggravation, considering the cost of the kits with seals and boots alone. Does any one have that link?

Paul Barrera '91 $$$$4

jheis

Brendan:

Do you have a source (or spec's) for the screws? It would be nice to have replacements on hand before I tackle this job.

The "Truechoice" site doesn't list anything for Brembos.

James

BC

James-

truechoice is where I purchased my seals and boots. But I bought all that.... 5 years ago.

Thats weird that they don't list those part numbers - the site looks very different from when I remember it.

The button head screws are just ones I bought at the local professional supply store - I brought the original version in and just compared it to their stainless steel options.

I guess I'm just not much help. I think I maybe should have taken better notes since 2002.

jheis

Thanks Brendan

With a one car garage, I was hoping to have the parts on hand rather than having the 928 dead in the driveway while I search for hardware.

James