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Old 11-07-2012, 10:32 PM   #1
the bruce
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Lightbulb TT-RS/Golf R master cylinder

Did anyone fit the TT-RS/Golf R master cylinder?

23.81 mm instead of 22.2 mm GTI. I'd expect a stiffer pedal feel.


for information on brakes fluids > CLICK
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Last edited by the bruce; 03-12-2015 at 05:16 PM.
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Old 12-02-2012, 01:30 PM   #2
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When fitting RS3/TT-S or most aftermarket brakes to a Mk.VI GTI (23,81 mm MC) you'll
get increased pedal travel. A bigger MC reduces wheel travel. Both is simple physics.

- 22,22 mm (Mk.V GTI)
- 23,81 mm (Mk.V R32, Mk.VI GTI, Golf R)
- 25,40 mm (RS3 + TT-RS)

That's the way it is at least in continental Europe. RHD cars at least do come with different
brake booster.
From what I read unfortunately the 25,40 mm MC does not fit smaller brake boosters.

Interesting to see VW changed from the small 22,22 mm MC on the Mk.V GTI to the same
23,81 mm MC the old R32 already had. That does mean a Mk.VI GTI is better prepared for
fitting R-brakes than the Mk.V GTI.

If you want to buy 'uprated' brakes I strongly recommend to determine the effective surface
of the caliper pots before you make any decision. This is extremely important. Sadly most
people don't know what they're doing when buying 'big brakes'.
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Old 12-07-2012, 04:16 PM   #3
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Bruce,

how intensive of a install would it be to fit that BMC into our cars. Do you know if we would have to bend new brake lines also.
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Old 01-21-2013, 12:58 AM   #4
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piston size/area



1. stock front caliper:


Golf/GTI - Ate FN3 54 mm caliper: 2290 mm˛

S3/R32/R - FNRG 57 mm: 2552 mm˛



2. aftermarket - proper match:


Boxster: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Brembo GT caliper A: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Stoptech ST-40: 38 mm + 34 mm > 908 mm˛ + 1134 mm˛ = 2043 mm˛




3. aftermarket - poor match:


Forge: 707 mm˛ + 1046 mm˛ + 1164 mm˛ = 2917 mm˛

Q7/Touareg/Cayenne (three variants):

34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm˛
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm˛
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm˛



4. master cylinder diameter:

- 22,22 mm > 388 mm˛ (Mk.V GTI)
- 23,81 mm > 445 mm˛ (Mk.V R32, Mk.VI GTI, Golf R)
- 25,40 mm > 507 mm˛ (RS3 + TT-RS)



ps
If you know the piston diameter: Pi * radius˛ = area
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Last edited by the bruce; 01-21-2013 at 05:07 AM.
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Old 01-21-2013, 03:24 PM   #5
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subd if someone tries ttrs, I'm doing the 17z so a bit bigger would be nice.
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Old 01-21-2013, 05:07 PM   #6
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Quote:
Originally Posted by U-20T View Post
subd if someone tries ttrs, I'm doing the 17z so a bit bigger would be nice.
Check out the MKV post
http://www.golfmkv.com/forums/showth...81#post3519981
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Old 01-22-2013, 12:27 PM   #7
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AP Racing kit added:


piston size/area



1. stock front caliper:


Golf/GTI - Ate FN3 54 mm caliper: 2290 mm˛

S3/R32/R - FNRG 57 mm: 2552 mm˛



2. aftermarket - proper match:


AP Racing 6-pot CP7068-00 (355x32 ) > 2350 mm˛

Boxster: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Brembo GT caliper A: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Stoptech ST-40: 38 mm + 34 mm > 908 mm˛ + 1134 mm˛ = 2043 mm˛




3. aftermarket - poor match:


Forge: 707 mm˛ + 1046 mm˛ + 1164 mm˛ = 2917 mm˛

Q7/Touareg/Cayenne (three variants):

34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm˛
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm˛
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm˛



4. master cylinder diameter:

- 22,22 mm > 388 mm˛ (Mk.V GTI)
- 23,81 mm > 445 mm˛ (Mk.V R32, Mk.VI GTI, Golf R)
- 25,40 mm > 507 mm˛ (RS3 + TT-RS)



ps
If you know the piston diameter: Pi * radius˛ = area
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Old 01-22-2013, 06:24 PM   #8
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Well that explains why my Stoptechs have such a nice firm pedal with less travel
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Old 01-22-2013, 06:59 PM   #9
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Indeed, Dan !!


Found some more - Boxster S and 993/996 Turbo:



piston size/area



1. stock front caliper:


Golf/GTI - Ate FN3 54 mm caliper: 2290 mm˛

S3/R32/R - FNRG 57 mm: 2552 mm˛



2. aftermarket - proper match:


AP Racing 6-pot CP7068-00 (355x32 ) > 2350 mm˛

Boxster: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Boxster S: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

993 Turbo: 36 + 44 mm > 1018 mm˛ + + 1520 mm˛ = 2538 mm˛ (on the edge)

Brembo GT 'A-caliper': 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Stoptech ST-40: 38 mm + 34 mm > 908 mm˛ + 1134 mm˛ = 2043 mm˛



3. aftermarket - poor match:


Forge: 707 mm˛ + 1046 mm˛ + 1164 mm˛ = 2917 mm˛

996 Turbo: 40 + 44 mm > 1257 mm˛ + 1520 mm˛ = 2777 mm˛

Q7/Touareg/Cayenne (three variants):

34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm˛
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm˛
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm˛



4. master cylinder diameter:

- 22,22 mm > 388 mm˛ (some Mk.V GTI, Mk.V + Mk.VI Golf)
- 23,81 mm > 445 mm˛ (Mk.V R32, Mk.V GTI, Mk.VI GTI, Golf R)
- 25,40 mm > 507 mm˛ (RS3 + TT-RS)



If you know the piston diameter: Pi * radius˛ = area
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Old 01-24-2013, 06:49 PM   #10
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Quote:
Originally Posted by the bruce View Post
If you know the piston diameter: Pi * radius˛ = area
I know the US is lagging the industrial world in math and science, but give us some credit here!
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Old 01-25-2013, 09:59 PM   #11
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Old 01-30-2013, 08:20 AM   #12
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piston size/area



1. stock front caliper:


Golf/GTI - Ate FN3 54 mm caliper: 2290 mm˛

S3/R32/R - FNRG 57 mm: 2552 mm˛



2. aftermarket - proper match:


AP Racing 6-pot CP7068 (355x32 ) > 2350 mm˛ (small bore version of CP7040 caliper for Mk.V/VI)

AP Racing 6-pot CP5570: 27.0 + 31.8 + 38.1 > 573 mm˛ + 794 mm˛ + 1140 mm˛ = 2507 mm˛

Boxster: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Boxster S: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

993 Turbo: 36 + 44 mm > 1018 mm˛ + + 1520 mm˛ = 2538 mm˛ (on the edge)

Brembo GT 'A-caliper': 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Stoptech ST-40: 38 mm + 34 mm > 908 mm˛ + 1134 mm˛ = 2043 mm˛



3. aftermarket - poor match:


Forge: 707 mm˛ + 1046 mm˛ + 1164 mm˛ = 2917 mm˛

996 Turbo: 40 + 44 mm > 1257 mm˛ + 1520 mm˛ = 2777 mm˛

Q7/Touareg/Cayenne (three variants):

34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm˛
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm˛
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm˛



4. master cylinder diameter:

- 22,22 mm > 388 mm˛ (some Mk.V Golf)
- 23,81 mm > 445 mm˛ (Mk.V R32, Mk.V GTI, Mk.VI GTI, Golf R)
- 25,40 mm > 507 mm˛ (RS3 + TT-RS)



If you know the piston diameter: Pi * radius˛ = area
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Old 02-22-2013, 12:34 PM   #13
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some more:


piston area



1. stock front:


O2 RS/Golf/GTI - Ate FN3 54 mm: 2290 mm˛

S3/R32/R - FNRG 57 mm: 2552 mm˛



2. aftermarket - fits properly:


AP Racing 6-pot CP7068 (355x32 ) > 2350 mm˛ (special version of CP7040-caliper for Golf V/VI, Scirocco etc.)

AP Racing 6-pot CP5570: 27.0 + 31.8 + 38.1 > 573 mm˛ + 794 mm˛ + 1140 mm˛ = 2507 mm˛

Boxster: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Boxster S: 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

993 Turbo: 36 + 44 mm > 1018 mm˛ + + 1520 mm˛ = 2538 mm˛

Brembo GT 'A-caliper': 40 mm + 36 mm > 1257 mm˛ + 1018 mm˛ = 2275 mm˛

Stoptech ST-40: 38 mm + 34 mm > 908 mm˛ + 1134 mm˛ = 2043 mm˛

Mov'it:

4s2 - 36 / 44 = 2538 mm˛
4s3 - 36 / 44 = 2538 mm˛ (u.a. als VAG-Kit mit 322x32er Scheibe, geht unter 17")
4m6 - 36 / 44 = 2538 mm˛
6m1 - 28 / 32 / 38 = 2554 mm˛



3. aftermarket - mismatch:


Forge: 707 mm˛ + 1046 mm˛ + 1164 mm˛ = 2917 mm˛

Mov'it:

4s4: 40 / 44 = 2777 mm˛
4s5: 38 / 46 = 2796 mm˛
6m3: 30 / 34 / 38 = 2749 mm˛


Brembo 8-pot RS4/R8/Gallardo: 28 + 28 + 32 + 32 mm > 2840 mm˛

Brembo 8-pot RS6 : 4192 mm˛

996 Turbo: 40 + 44 mm > 1257 mm˛ + 1520 mm˛ = 2777 mm˛

Q7/Touareg/Cayenne (there are 3):

34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm˛
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm˛
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm˛



4. master cylinder:


- 22,22 mm > 388 mm˛ (some Golf V, evtl. some Scirocco etc.)

- 23,81 mm > 445 mm˛ (Golf V R32, Golf V GTI, Golf VI GTI, Golf R, Scirocco 2.0T + R)

- 25,40 mm > 507 mm˛ (RS3 + TT-RS)



5. rear:


GTI/RS: C38 > 1134 mm˛

S3/R32/R: C41 > 1320 mm˛

Movit 4m1: 28 / 30 = 1323 mm˛

Movit 4m2: 28 / 30 = 1323 mm˛



Pi * Radius˛ = area
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Old 02-22-2013, 12:42 PM   #14
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I guess no one has tried the Golf R master cyl on the GTi yet. Bleeding that thing would be a bitch..
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