996 GT3 mk2 - front caliper rebuild kit

[sleep envy]

Just checked on line and most sites are saying that you need to measure the rubbers as there's two sizes.

Unfortunately I don't have that luxury and need to pre-order, does anyone know what sizes I need?

[sleep envy]

Can anyone confirm if the following piston sizes are correct - 38mm, 32mm + 28mm?

[ontheloop]

I've just done all four calipers on my 2004 GT3 (PCCB) (lovely job). Are you talking about piston seals and dust seals?

[sportsandclassic]

sleep envy said:

Can anyone confirm if the following piston sizes are correct - 38mm, 32mm + 28mm?

According to parts system that is correct for MKII GT3.

[sleep envy]

sportsandclassic said:

According to parts system that is correct for MKII GT3.

Perfect, thanks.

ETA - why does the Porsche parts catalogue only show 4 dust boots per front caliper, shouldn't there be six (one for each piston)?

Also, is it safe to assume that for each sized O-ring there will be the same sized dust boot?

Sorry for the numpty Qs, I've never rebuilt calipers before.

Edited by sleep envy on Monday 23 July 16:35

[sleep envy]

ontheloop said:

I've just done all four calipers on my 2004 GT3 (PCCB) (lovely job). Are you talking about piston seals and dust seals?

Yup, but for non-PCCB brakes. I've been told the normal big reds are a different size??

[ontheloop]

sleep envy said:

Yup, but for non-PCCB brakes. I've been told the normal big reds are a different size??

I ordered for parts from OPC Bournemouth (very helpful) in the PCCB front calipers there are six pistons in three different diameters and the seals and dust caps came together.

I find that the illustrations on the parts catalogue can sometimes be a little confusing as the only show a "generic" diagram, best to look at the column that shows number fitted per car.

[sleep envy]

ontheloop said:

I find that the illustrations on the parts catalogue can sometimes be a little confusing as the only show a "generic" diagram, best to look at the column that shows number fitted per car.

Isn't that the truth!!

Whilst it shows the dust caps it doesn't mention that the kits come with the O-rings.

[sportsandclassic]

sleep envy said:

Isn't that the truth!!

Whilst it shows the dust caps it doesn't mention that the kits come with the O-rings.

I have had the dust seals for mine and they don't come with seals...