some more:
piston area
1. stock front:
O2 RS/Golf/GTI - Ate FN3 54 mm: 2290 mm²
S3/R32/R - FNRG 57 mm: 2552 mm²
2. aftermarket - fits properly:
AP Racing 6-pot CP7068 (355x32 ) > 2350 mm² (special version of CP7040-caliper for Golf V/VI, Scirocco etc.)
AP Racing 6-pot CP5570: 27.0 + 31.8 + 38.1 > 573 mm² + 794 mm² + 1140 mm² = 2507 mm²
Boxster: 40 mm + 36 mm > 1257 mm² + 1018 mm² = 2275 mm²
Boxster S: 40 mm + 36 mm > 1257 mm² + 1018 mm² = 2275 mm²
993 Turbo: 36 + 44 mm > 1018 mm² + + 1520 mm² = 2538 mm²
Brembo GT 'A-caliper': 40 mm + 36 mm > 1257 mm² + 1018 mm² = 2275 mm²
Stoptech ST-40: 38 mm + 34 mm > 908 mm² + 1134 mm² = 2043 mm²
Mov'it:
4s2 - 36 / 44 = 2538 mm²
4s3 - 36 / 44 = 2538 mm² (u.a. als VAG-Kit mit 322x32er Scheibe, geht unter 17")
4m6 - 36 / 44 = 2538 mm²
6m1 - 28 / 32 / 38 = 2554 mm²
3. aftermarket - mismatch:
Forge: 707 mm² + 1046 mm² + 1164 mm² = 2917 mm²
Mov'it:
4s4: 40 / 44 = 2777 mm²
4s5: 38 / 46 = 2796 mm²
6m3: 30 / 34 / 38 = 2749 mm²
Brembo 8-pot RS4/R8/Gallardo: 28 + 28 + 32 + 32 mm > 2840 mm²
Brembo 8-pot RS6 : 4192 mm²
996 Turbo: 40 + 44 mm > 1257 mm² + 1520 mm² = 2777 mm²
Q7/Touareg/Cayenne (there are 3):
34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm²
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm²
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm²
4. master cylinder:
- 22,22 mm > 388 mm² (some Golf V, evtl. some Scirocco etc.)
- 23,81 mm > 445 mm² (Golf V R32, Golf V GTI, Golf VI GTI, Golf R, Scirocco 2.0T + R)
- 25,40 mm > 507 mm² (RS3 + TT-RS)
5. rear:
GTI/RS: C38 > 1134 mm²
S3/R32/R: C41 > 1320 mm²
Movit 4m1: 28 / 30 = 1323 mm²
Movit 4m2: 28 / 30 = 1323 mm²
Pi * Radius² = area