HELP - Front Caliper Pistons and seals

[douglas96]

Assuming that I've measured them correctly as the pistons in my calipers are almost at base 'cos the pads are nearly new, (I've measured 3) I reckon that they're 32mm.

The pistons are in 2 different diameters;

2 - 34mm,
4 - 36mm.

[Jim Haseltine]

I thought "What?" then some Googling showed why. Brembo pistons are stepped, with the pad face being some 4mm smaller in diameter than the body of the piston.
38mm piston has a 34.4mm face
44mm piston has a 40mm face
From that I assume (not a good thing) that I measured the 36mm pistons though from many years experience I know that the accuracy of Audi's published technical info is somewhat lacking at times.

[ATinOf]

Should be able to source seals from this thanks guys, I forgot that info was in ELSA.

I've also asked Brembo for puston dimensions but I'm not holding my breath.

Ideally I'd like to replace pistons and seals, the pistons that were tight have flaked the outer surface, from excess heat I'm presuming!

It's my daily driver so I cant strip it down till I have all the parts

[Jim Haseltine]

https://www.frentech-uk.co.uk/ might be able to help, they do various pistons for Brembo.
Frentech-UK
Unit 5, Dean Mill
Plumbe Street, Burnley
BB11 3AG
01282 789800

[PPETKOV]

Based on ETKA the pistons should be available for purchase from VW/AUDI dealers.
For example from here
Btw: I beleive that you have to get also number 7 from diagram that IanH755 provided.

At the end you should be looking for:
2 x 4F0698471A >>> regular price according to ETKA 77.23 EUR per set
2 x 4F0698471 >>> regular price according to ETKA 25.76 EUR per set