Piston size on 429/430 Porsche 4 pots

[Error404]

Anyone know the piston sizes on the 996 Big Reds as fitted to the C4S & GT3

[Takumi]

Hi Alex,

996-351-429 & 996-351-430 GT2/GT3 C4 Turbo Front Calipers...

Piston Sizes 38 & 44mm

[Rocco]

Big reds?

The Mitsubishi Evo V,VI,VII,VIII,IX brembos 4 pot calipers has 2x 42mm and 2x 46mm pistons.

Works originally with 320x32 rotors and are far cheaper to buy second hand than the overpriced gt3 4pot big reds.

[Thuppu]

Tomas, what are you still doing here? Go away ricer!

[Error404]

Thanks for the info guys
I did look at the Evo calipers but I'm not sure they can swallow as large a rotor?

[Rocco]

Tomas, what are you still doing here? Go away ricer!

Still got 2 Audis , 2x engines, and hundred parts stored

[Rocco]

Thanks for the info guys
I did look at the Evo calipers but I'm not sure they can swallow as large a rotor?

How large?

[Error404]

Around 350mm?
Also what size rotor annulus do they use? (The width of the contact patch on the rotor?)

TBH I never see them go for much less than £300, which you can pick up GT3 calipers for too

[Rocco]

Around 350mm?
Also what size rotor annulus do they use? (The width of the contact patch on the rotor?)

TBH I never see them go for much less than £300, which you can pick up GT3 calipers for too

I can ask in the MLR forum about disc thick and diameter options

But what everyone does is fitting very good quality 2 piece rotors from Performance Friction , good fluid , braided lines and very good pads for your requirements ( pagid , carbotech, PF ... ) and that's more than enough .

Or they goes to the 6 pot conversion with AP or Alcons... +2k£ ..




About calipers, I've seen bargains in the private part for sale forum...

[Error404]

Thanks Thomas. Yes this is my plan, floating two piece setup
I will get on MLR to have a look

[GazzaG60]

iirc evo discs have issues.

got gt2 6 pot for the little extra cost. saves doing it again

[Error404]

Yeah the GT2 6 pots are very nice and light, but they cost a fortune second hand and pads are also extortionate.

[_ShurikeN]

With such brake disc diameter why not to go Porsche Cayenne 6 pots? At ours they are often cheaper than RS2/EVO/Boxter/996 when second-hand.

S8 D2 345mm brembos would be my favorite option because of radial bracketing and second hand price much lower than porsches' brembos.

[Jamo]

Alex you are better off going Porsche Cayenne 6 pots as they are more readily available. However I had the GT3 4 pots on my S2 and they are effin fantastic brakes!

[Jamo]

Tomas, what are you still doing here? Go away ricer!