bimmen325

I Just purchased some new s4 calipers and they are differ from the calipers on my 91 s4, they have raised lettering part#20.4564.00.
Other than the raised Porsche emblem, are they the same or did porsche make a change from 87-91?

atb

When you say "new" do you mean new to you (as in used?) You are describing pre-91 S4 Calipers. If so, they also use an older style dust seal, which I think may be NLA. (Can someone confirm or deny this?)

atb

If they are new off the shelf, post some pics. Would be interesting to see.

bimmen325

New as in never installed, they were parts on a display. a few scratches on the paint, but they have never been used.

Bill Ball

There were changes to the calipers in 87-90, during the 89 MY, detailed below. So, there is an early and late 89 caliper with differences in the piston, seals, dustboot and dustboot grooves in the caliper. Prior to 90, the lettering was raised, then went to decal.

Bilal928S4

My 90S4 has raised letters on the caliper body. My 91GT has the painted on Porsche logo on the caliper body. Both of them seem to have the same innards.

BC

So no one, anywhere, as found the proper parts to repair the earlier S4 calipers with the wiper seals?

So these calipers are essentially useless at the end of the life of the seals?

UKKid35

Mine have 220k miles on them, so I don't think the seals are that delicate.

Hilton

Just as a data point - my MY89 S4 has raised lettering and the later style of dust boots and seals. It left the factory in late '88 according to the letter I have from Porsche.

fraggle

The pistons may have been updated to the new style. The calipers themselves isn't the issue, it's the pistons. You can update you're set for $400, that's $50 per piston.

Bilal928S4

I think the rebuilt kits (piston, seal and dust boot) is less than $30 per piston actually less than $25 IIRC.

9x8

Which still makes it ~$400 for the rebuild of all 4 calipers (since it's 4 pistons per caliper).

ROG100

The kits are available from Porsche at circa $50 per piston for the earlier 87/88 cars.
A new GTS "Big Black" caliper is $400. Later seal kits are circa $20 per piston.

IIRC the earlier Brembo seal kits are available from Paragon and superior to the Stoptech product.